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Purpose:to actualize students' knowledge obtained in grade 5;
Tasks:
- restore knowledge of informatics as a science on storage, processing and information transfer methods;
- repeat hardware I. software computer;
- restore computer knowledge as a universal machine to work with information;
- introduce the main stages of history computer equipment;
- improve the skill work with the keyboard simulator.
Basic concepts:
- information;
- data;
- computer science;
- a computer.
During the classes
1. Computer as a universal machine for working with information.
(Presentation 1)
Computers made a revolution in our lives. They changed the style of work, education, trade and entertainment of people. They are used doctors and farmers, teachers and banking workers, engineers and designers. Without computers, do not do when preparing for the publication of books and magazines, in scientific and engineering calculations, when creating special effects in movies and on television and in many other cases. Some professions are fully related to computers.
The object suitable for many purposes with a variety of purpose performing a variety of functions is called universal.
Computer is a universal machine for working with information. The word "universal" emphasizes that the computer can be used for many purposes: to process, store and transmit the most diverse information, used in the most different types human activity.
But whatever the man does with the help of a computer, it is always working with information.
2. Repeat the concept of information. Types of information on the method of obtaining and presenting.
What do you call information?
How does a person perceive the information?
How can the information that we get?
Using a computer is always working with information - numbers, texts, sounds or images.
The most diverse information presented in the form suitable for computer processing, name data.
Data processing The computer is performed using programs installed on it. The wider range of software, the greater the tasks can be solved on the computer.
But at the same time, do not forget the principle of IBM that, the car should work, man think.
3. Excursion to the history of computing technology.
(Presentation 2)
Already in the Stone Age, the need for the score arose. He helped in this a distant ancestor of their primitive "computer" - ten fingers in their hands.
In Western Europe, there was a whole system that allowed representing the numbers to 9999 on the fingers.
With the development of civilization, various receptions of the account appeared. They were needed and collectors of taxes, merchants, and craftsmen, and the usurists. The art of the account owned a few specially trained people - counters. They used counting tools - Abaki.
The simplest aback is a board with cutting in it, chutes.
Abaki was already used in the V-IV centuries to our era. The word "Abak" has a Greek origin and literally means "dust", although its semantic meaning is the "counting board". What is the case? The answer is simple: Initially, the pebbles laid out on a completely flat board, and so that they do not roll from their original position, the board was covered with a thin layer of sand or dust. And from the words "pechers" (in Latin - "Calculus") the name of the modern counting device was the name - "Calculator".
Abacus was used in ancient Greece, and in ancient Rome, and then in Western Europe until the XVIII century. He looks like familiar bills - bones on the metal spokes inserted into the frame.
The scores used different peoples, and each people they had their own characteristics. Chinese accounts suan Pan On each wire, seven balls, and two are separated from the rest of five. IN russian accounts Ten stones in each row, and in Western European - nine.
In Japan and today, competences for the account rate between people, armed with Japanese accounts soroban and computing machines operators. And, as a rule, the calculators will defeat the accounts. After all, so that the car began to count, it is necessary to make a program for it.
There was time, and the needs of people in the processing of numerical information increased. The first ideas of the mechanization of the computing process appeared at the end of the XV - early XVI century. This is evidenced by the sketch of the summing device, designed by Leonardo da Vinci, found in the late 60s of the last century. In these drawings, today, an American IBM computers manufactures an operationable car for advertising.
In 1642, the famous French physicist and mathematician closer was created and won the first mechanical counting machine - an arithmeter. (Pascaline)
In 1673, the great German mathematician and philosopher Gottfried Wilhelm Leibniz constructed his counting machine, which allowed not only to fold and deduct, but also multiply and divide the multivalued numbers.
In Russia, the arithmometer, created in 1874 by the Russian engineer Villega Oder, successfully competed with the best arithmometers of European firms. His modification "Felix" was produced in our country until the 70s of the twentieth century.
The next important step of the development of computing equipment falls on the XIX century. In 1834, English Mathematician, Professor Cambridge University Charles Bebbage developed a project of the first programmable computing machine.
The car, invented by Charles Bebbird, was similar to a real factory for the production of calculations. Charles Bebadja came the idea to use punch cards. In 1985, this car was built in London's Museum in London.
In 1890, a Hollerite car was created in which the idea of \u200b\u200busing perfocarts was practically implemented.
The first generation of EUM.
The first fully electronic computing machine Eniac was built in the United States in 1946. Its dimensions were enormous: more than 30 m in length and 85 m3 for the occupied volume. The weight of the car was approximately 30 tons. Storage and processing of data in it were carried out with 18 thousand electronic lamps.
In our country in 1948. The year Academician Sergey Alekseevich Lebedev proposed a project first on the continent of the EUM-Little Electronic Counting Machine (MESM). In 1951 MESM is officially commissioned, computational tasks are regularly solved on it. The machine operated with 20 discharge binary codes with speed 50 operations per second, had operational memory in 100 cells on electronic lamps. It has about 6,000 electrovacuum lamps (about 3,500 triododes and 2500 diodes), covers an area of \u200b\u200b60 m2, consumes the power of about 25 kW.
Second generation of EUM.
After a decade, in the early 60s per shift electronic lamps Transistors came. The emergence of the second generation of computers is connected with them.
In 1951, American J. Forester created WhireWind -1 with memory on magnetic cores.
In 1953, our industry began to produce an electronic computing machine "Arrow". The "Arrow" computing machine together with the auxiliary equipment occupied an area of \u200b\u200b500 square meters. That would be enough for 10 apartments.
In the USSR, in 1967, the most powerful EUM of the second generation of BESM-6 came into account (large electronic Counting machine), which could perform 1 million operations per second. BESM-6 used 260 thousand transistors.
Emm of the third generation
In 1968, Barrowz produced the first computer operating on integrated circuits in the USA.
Starting from the 70s began to use integrated circuits. The size of such a scheme is no more pea, and thousands of transistors are packed in it, each of which has dimensions comparable to the thickness of the human hair. Machines decreased so much that they could already be posted on the desk.
As the legend says, the great-grandmother of the modern mouse was invented in 1968 by Douglas Engelbart. By the way, he also called his device "mouse".
Fourth stage
The development of high technologies led to the creation of large integrated circuits - bis, including tens of thousands of transistors.
The first personal computer was Arr1e-1 created in 1976.
In 1982, IBM began to manufacture IBM PC personal computers ("grandparents" of modern IBM-compatible computers).
Modern personal computers are compact and have thousands of times greater speed compared to the first personal computers.
4. Homework.
- Uch. p. 9-10.
- Questions page 10.
- Optional: Chapter 4 Material for curious §4.13 -4.18, read.
- Practical work. Basics user interface: Desktop, application window, computer management (repetition);
- Work on the keyboard simulator.
- Summarizing. End of work.
Literature:
- Bosova L.L. Computer science: textbook for grade 6. - M.: Binin. Laboratory of Knowledge, 2010.
- http://www.gym075.edusite.ru/istoriyavt.html - development of computing equipment and a generation of computers.
- http://historyvt.narod.ru/ - development of computing equipment and a generation of computers.
- http://forum.antichat.ru/thread141014.html - History of the computer pictures interesting is interesting.
Educational institution: MKOU "SOSH №4"
Brief description of the work:
Publication date:2017-04-25 Test on the topic: Computer - Universal Machine for Working with Information Mikhailovsky Svetlana Vladimirovna Test for checking students' knowledge of grade 5 on the topic "Computer - Universal Machine for Working with Information"
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Test on the topic: Computer - Universal Machine for Working with Information
Test theme: Computer - Universal Machine for Working with Information
Start of form
1. Select the desired to determine: "Computer is".
universal software controlled device for processing information.
Device for performing calculations.
Device for creating text documents.
2. Hard disk function:
used to handle information.
Used for long-term storage of information.
Used to enter information.
3. Select the keyboard desired to determine.
information storage device.
Information output device.
4. Select Proper Dance for the Mouse Termination
device for fast movement on the screen and selection necessary information.
Information input device by pressing the keys.
5. What is the processor?.
a device intended for computing, processing information and managing computer
6. Select the appropriate description for the computer's RAM?
device for long-term storage of information.
The information in it is only during the operation of the computer.
The information presented in the form suitable for computer processing.
7. What is the monitor?
information input device by pressing the keys.
Device for long-term storage of information.
Device visual display information.
8. Printer function.
print information on paper.
visual display of information.
Information processing and managing computer work.
Universal means suitable for many purposes performing a variety of functions. Let's remember the computer - a universal machine for working with information in a variety of human activities. !! Information Processing Information Transfer Storage Information
Science Informatics is studying all sorts of ways to transfer, storing and processing information. Let us remember the data call the most diverse information presented in the form suitable for computer processing. The computer processes data on specified programs. !!
PC Hardware Basic Devices System Block Monitor Keyboard Advanced Devices Devices for Input Device Output Device Device Device Minimum Required Kit For User Operation Expands PC PC Computer Features Computer (calculator) - Electronic information for working with information
The main thing in the computer is a system unit that includes a processor, RAM, hard disk, power supply and other components. How the computer is arranged ProcessorProcessor Long term memory Memory (Hard disk) Long-term memory Memory (Hard disk) RAM MEMORY Power supply other components
NGMD (Winchester) NGMD CD and DVD-ROM CD and DVD-RW Flash Memory Removable discs Memory Cards Memory Device and Processing Incomation Summer Long-term RAM (RAM - RAM) Permanent Memory (ROM - ROM) Cache memory Processing Processor Memory consists of cells same size (1 byte \u003d 8 bits). Each memory cell has its own unique address.
The most important study of all sorts of ways to transfer, storing and processing information is engaged in the science of informatics. Store, process and transmit information to a person helps the computer universal machine for working with information. The computer hardware is distinguished by entering, processing, storing and output information. Information input devices are keyboard, mouse, scanner, microphone, etc. Information processing device processor. Information storage devices rAM, external memory on the hard disks. Information output devices monitor, printer, acoustic speakers.
Information about the information you are interested in the computer is a universal program controlled device for processing information processor A device intended for computing, processing information and managing the computer's work. RAM information in this memory is only during operation computer hard The disk is used for long-term storage of the keyboard device for entering information by pressing the keys monitor. Visual information display device Mouse device for quick movement across the screen and select the desired information printer device for printing information on paper Information provided in the form suitable for computer processing hardware A combination of all computer devices questions questions and tasks ?? 15 p. 14
Find and cross out the "unnecessary" device in each group. Questions and tasks ?? Breast Developer Joystick Printer Monitor Breaker Joystick Printer Monitor Scanner Keyboard Monitor Microphone Scanner Keyboard Monitor Microphone Keyboard Mouse Scanner Acoustic Speakers Keyboard Mouse Scanner Acoustic Speakers Printer Monitor Scanner Headphones Printer Monitor Scanner Headphones Check 17 pp. 15
Presentation to the first lesson in the 6th grade in UMC Bosova L.L. 1. We repeat the safety regulations 2. Repeat the material of the 5th grade by sections: "Information", "How the computer works", "computer in the service of a person" 3. Moving to study the topic: "Computer - Universal Machine for Working with Information "4. The results of the lesson, d / s
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Signatures for slides:
Safety regulations
If you are a good boy, then do not sue in a rosette finger, do not play wires: Is there no paradise? Safety regulations
Perheom to be able, and on the keys do not bay, do this fact, electric contact. Safety regulations
The mouse can become a friend, if it is not offended. Dress her skillfully, do not twist in your hands. Safety regulations
If you enter "Answer", and the computer will say "no", do not knock on the display, it is better to teach the rules! Safety regulations
If a crash gives a car, you need patience, it does not happen without any problems with a smart computer! Safety regulations
If somewhere he picks up, or something smokes, the time is not a sweat - you need to call an adult. After all, we know from the spark themselves, the flame can be disguised. Safety regulations
Everyone knows the rest: so as not to jump from the spot did not shout, did not push, they did not fight for computers. Safety regulations
In jackets, fur coats and coats, no one comes to us. In the dirty shoes, friends, in the office can not be. Safety regulations
Start work strictly with a teacher permission, and note: You are responsible for ordering in the office. Safety regulations
1 Recall a little grade 5
And the information is information about the world around us.
from books How does a person receive information? from the teacher from the Internet from friends
Man and Animals receive information through sense organs of senses Organs Information Vision Hearing Taste Opportunity Touch Other senses
Types of information on the form of the presentation of the number quantitative characteristics of the surrounding world - growth, weight, age, forest area .... Text All that is printed or written on any of the existing languages \u200b\u200bgraphic drawings, paintings, schemes, drawings, cards, photos, etc. Sound all that we hear - human speech, music, bird singing, etc. Video image sequence - movies, cartoons, etc.
The science of informatics is engaged in learning all sorts of ways to transfer, storing and processing information. Store, process and transmit information to a person helps a computer.
The computer consists of devices performing some functions of a thought: human organs Information process Computer Devices Feeling Organs Acceptance (Entering) Information Keyboard, Mouse Scanner Brain Storage Information Brain Processing Processor Speech Organs and Muscular System Transmission (output) Monitor, printer
2 Computer Hardware and Software
How the computer is arranged
The main thing in the computer is a system unit, which includes the processor, memory, drives on rigid and magnetic disks, power supply, etc.
The processor is intended for computing, processing information and management of computer work.
Computer memory serves to store data. There are two types of memory: operational and constant. Devices that implement them are called RAM and ROM. The ROM stores the instructions that determine the operation of the computer on. These instructions are not deleted even when the computer turns off. All programs and data required for computer work are placed in RAM. After disconnecting the computer, all the information contained in the RAM is deleted. RAM board constant storage device
For long-term storage of information, a long-term memory is used: magnetic discs, optical discs, other devices. Magnetic discs are rigid and flexible. Hard discs of the large capacity are built into the system unit and are constantly there. The system block contains flexible magnetic disks drives - disks. Unlike flexible, hard drives Cannot be transferred. Recently, more spread received optical discs, flash drives.
To enter information in the computer's memory, the following devices are applied: The keyboard scanner to display information in the computer's memory applies the following devices: Monitor Printer
Additional devices: Mouse acoustic speakers Joystick others all make up hardware Computer Perform the hardware test:
26 The car should work, a person is to think. IBM Principle 3 Computer in Human Service
27 Calculator Typewriter Personnel Personal Secretary Accountant Reference Bureau Librarian Publisher Translator Postman Artist Multiplier Designer Designer Designer Architect Designer Composer and Musician doctor teacher Leisure organizer "Professions" Computer
Go to the study of a new topic: § 1.1 - Who uses the computer in his professional activities? - What operations can be performed using a computer? Universal call an object suitable for many purposes, with a variety of purposes performing various functions. - Is it possible to say that the computer is a universal car? - What are your actions with information? - What information does the computer work with? Data is called a variety of information presented in the form suitable for computer processing. Data processing is performed on a computer using programs.
Fill out the scheme: In the appropriate blocks, specify the name of the programs that are processed by text, graphic, numerical and sound information in the computer.
Programs Text Information Number Sound information Graphic information Notepad sound recording MS POWER POINT Calculator Paint MS Excel MS Word Movie Maker
Performing tasks number 3 and No. 4 on page 4 of the working notebook. Homework: § 1.1, RT: No. 1, No. 2 - p.3. Material for curious: p.103-112 § 4.14-4.18 Let us sum up: p.10 in the textbook what does the word "universal" mean? Why is the computer is a universal machine for working with information? Give an example of using computers? Recall which programs are intended for processing numerical, textual and graphics information?
Lesson 2. Computer - Universal Machine for Working with Information .
Objectives lesson:
Help students learning to master the computer, the concept of the basic configuration of the PC, give the basic concepts necessary to start working on the computer.
Education of informational culture of students, attentiveness, accuracy, discipline, perfection.
Development of cognitive interests, work skills with mouse and keyboard, self-control, ability to outline.
Planned educational results:
subject - knowledge of the main devices of the computer and their functions;
metaPered - Basics of ICT competence;
personal - idea of \u200b\u200bthe role of computers in life modern man; The ability and willingness to adopt the values \u200b\u200bof a healthy lifestyle due to the knowledge of the basic hygienic, ergonomic and technical conditions for the safe operation of information and communication technologies (ICT)
Equipment: Personal computer (PC) teacher, multimedia projector, screen; PC students.
Electronic application To the textbook: 1) Presentation "Computer - Universal Machine for Working with Information".
Lesson plan:
1. Org. moment. (2 minutes)
2. Actualization of knowledge. (7 min)
3. Theoretical part. (22 min)
4. D / s (2 min)
5. Questions of students. (5 minutes)
6. The result of the lesson. (2 minutes)
During the classes:
1. Org. moment.
Greeting, checking present. Explanation of the course of the lesson.
2. Check knowledge.
At the last lesson, we start acquaintance with the computer. Today we will look at which computer devices are available, practically, each PC is why they need some of their characteristics.
3. Theoretical part.
Computer is a universal machine for working with information. The information presented in the form suitable for storing, transmitting and processing with a computer is called data.
The science of informatics is engaged in learning all sorts of ways to transfer, storing and processing information.
Sometimes they say "Personal Computer". Clarification "Personal" here is not by chance - this means its own, personal, affordable to most people, because there is a large number of Other types of computers that are not called personal - workstations for enterprises, servers for connecting many computers to the network, etc. In the future, saying "Computer" We will keep in mind exactly a personal computer.
Personal Computer - This is a computer designed to serve one worker. In its characteristics, it may differ from large computers, but it is functionally able to perform similar operations. Computer is a universal machine for working with information.The information presented in the form suitable for storing, transmitting and processing with a computer is called data.
PC basic configuration - minimal set hardwaresufficient to start working with a computer. Currently, a configuration is considered for desktop PCs, which includes four devices:
System unit;
Monitor;
Keyboard;
Mouse.
System Block - Main Block computer system. It contains devices that are considered internal. Devices connected to the system unit outside are considered external.
The system unit includes a processor, RAM, storage drives on hard and flexible magnetic disks, optical disks And some other devices. On the front panel, you see a few buttons - the Power button already known to you - the RESET button is rebooting the computer, which can be used only with the permission of the teacher. Several light indicators - inclusion and access to the hard disk. Two drives - for CDs and disks, talking about the next lesson.
Monitor - device for visual playback of symbolic and graphic information. Serves as an output device. They remotely resemble household TVs.
IN desk computers Usually used monitors on electron beam tube (CRT). The image on the monitor screen is created by a bunch of electrons emitted by an electron cannon. This electron beam accelerates high electrical voltage (tens of kilovolt) and falls on the inner surface of the screen, coated with a phosphor (substance glowing under the influence of the electron beam).
A bundled control system causes to run it line by the entire screen (creates a raster), and also adjusts its intensity (respectively, the brightness of the luminofor point luminescence). The user sees the image on the monitor screen, since the phosphor radiates light rays in the visible part of the spectrum. The image quality is higher than the smaller the size of the image point (luminofor point), in high quality monitors, the point size is 0.22 mm.
However, the monitor is also a source of high static electric potential, electromagnetic and X-ray radiation, which can adversely affect human health. Modern monitors are almost safe, as they correspond to rigid sanitary and hygienic requirements.
In portable I. pocket computers Apply flat monitors on liquid crystals (LCD). Recently, such monitors have become widely used in desktop computers.
LCD (Liquid Crystal Display, LCD monitors) are made of a substance that is in a liquid state, but at the same time has some properties inherent in crystalline bodies. In fact, these are fluids with anisotropy properties (in particular, optical) associated with ordering in the orientation of molecules. Liquid crystal molecules under the influence of electrical stress can change their orientation and as a result of this, change the properties of the light beam passing through them.
The advantage of LCD monitors in front of the monitors on the CRT is the absence of electromagnetic emissions harmful to humans and compactness. But LCD monitors have both disadvantages. The most important of them are bad color reproduction and lubrication of a fast moving picture. In other words, if you take a fairly high-quality electrical monitor, it will be suitable for any tasks without reservations - to work with the text, for processing photos, for games, and so on; At the same time, among the LCD monitors, you can select models suitable for games - but they are not suitable for working with photos, you can highlight models that have excellent color reproduction - but they are poorly suitable for dynamic games, and so on.
Monitors can have a different screen size. The size of the screen diagonal is measured in inches (1 inch \u003d 2.54 cm) and is usually 15, 17, 19 or more inches.
Keyboard - keyboard device designed to control the operation of the computer and enter information into it. Information is entered in the form of alphanumeric symbolic data. The standard keyboard has 104 keys and 3 informing about the operating modes of the light indicator in the upper right corner.
Mouse - a "graphic" control device.
When moving the mouse on the mat on the screen, the mouse pointer is moved, with which you can specify objects and / or choose them. Using the mouse keys (there may be two or three), you can set one or another type of operation with an object. And with the help of the wheel, you can scroll up or down without fit on the screen, text or web pages.
In optical-mechanical mice, the main working body is a massive ball (metallic, coated rubber). When moving the mouse over the surface, it rotates, the rotation is transmitted by two shafts, the position of which is read by infrared optopters (i.e., pairs "light emission-photodetector") and then converting into an electrical signal, controlling the mouse pointer movement on the monitor screen. The main "enemy" of such a mouse is pollution.
Currently widespread optical micein which there are no mechanical parts. The light source located inside the mouse illuminates the surface, and reflected the light is fixed with the photodetector and is converted to moving the cursor on the screen.
Modern models of mice can be wireless, i.e. Connecting to a computer without cable.
Peripherals call devices connected to a computer from outside. Usually these devices are designed to enter and output information.
Here are some of them: printer, scanner, modem, DVB card and satellite antenna, Web-camera.
The printer is used to display information on a paper carrier (paper).
There are three types of printers: matrix, inkjet, laser.
Matrix printers are shock action printers. The print head of the matrix printer consists of a vertical column of small rods (usually 9 or 24), which under the influence of the magnetic field "pushed" from the head and hit on paper (through the painting tape). Moving, the print head leaves the string of characters on paper.
The disadvantages of matrix printers are that they are printed slowly, produce a lot of noise and print quality leaves much to be desired (corresponds to about the quality of the typewriter).
In recent years, black and white and colored inkjet printers have been widespread. They use the ink print head, which under pressure throws ink from a number of smallest holes on paper. Navigating along the paper, the print head leaves the string of characters or striped image.
Inkjet printers can print enough (up to several pages per minute) and there are little noise. The quality of printing (including color) is determined by the resolution inkjet printerswhich can achieve photographic quality 2400 dpi. This means that the image strip horizontally 1 inch long is generated from 2400 points (ink droplets).
Laser printers provide almost silent printing. High speed Printing (up to 30 pages per minute) Laser printers are achieved at the expense of page printing, at which the page is printed immediately.
High typographical print quality laser printers Provided by high resolution, which can reach 1200 DPI and more.
Plotter. For the withdrawal and widescreen graphic objects (posters, drawings, electric and electronic circuits And pr.) Special output devices are used - plotters. The principle of action of the plotter is the same as the inkjet printer.
Scanners serve to automatically enter texts and graphics to the computer.
Scanners are two types: manual, tablet.
A manual scanner for a computer is similar to the scanner used in supermarkets for reading the barcode. Such a scanner moves along a sheet with information line by manually, and the information is entered into the computer for further editing. The tablet scanner looks and works in about the same way as xerox - the cover is lifted, the text or the picture is placed on the working field, and the information is read. Tablet scanners Nowadays, everything is usually colored.
Text information recognition systems allow you to convert scanned text from graphic format to text.
The resolution of the scanners is 600 dpi and above.
The modem or modem board serves to communicate remote computers by telephone network. The modem is internal (installed inside the system unit) and external (located next to the system unit and connects to it using a cable.
DVB card and satellite antenna serve for the so-called "asynchronous" computer connection to the Internet. If there is a DVB card and satellite antenna For connecting to the Internet, two communication channels are used: a modem is used to receive data from the user, and for receiving satellite canal, the flow rate in which is several times the modem.
For the organization on endless Internet video conferencing (or just chatter), a webcam is useful. With the help of these devices (and, naturally, quick local networks), You can at any time arrange a meeting with your employees, without opening it from agenic jobs. And this, as practice shows, gives a very tangible practical benefit.
Let's notify immediately - about the real camcorders here does not go. That is, you may not even dream of good optics, about high-quality color reproduction and the like of luxury. Yes, and keep the video from the webcam you will not come to mind. After all, this unit is needed completely for another - to provide an admission to your computer video stream with quality and volume sufficient to transfer on the Internet.
Here, however, there is one quarrel. Almost all webcams are designed to work by no means in slow mode of modem connection. Serve them digital Channels Communications - And then, these devices will show themselves in all its glory.
As for Russia, the ability to ensure the transfer of such data flow in real time, alas, until not. Neither in transmitting devices, no communication channels. Therefore, the maximum that your interlocutor can count on - this is the appearance of your personality in a tiny window of a slightly smaller cigarette pack (the image size is up to 320x200 points). If this is enough for you, well, the purchase of a webcam can slightly brighten up your gray computer weekdays.
Since the image of the webcam displays not static, you need to consider another important value - the framework of refreshments.
So, on the usual, modem connection, even with a tiny picture of 150x200 points of scheduled 24 frames, you will most likely not get (real - from 10 to 20). So, jerks and delays are inevitable ... However, do not be mistaken - alternative methods Connections with the Internet still stubbornly pierce their way and, perhaps, after a year, your vesati will be able to enjoy decent quality by the image of at least a quarter of the screen.
For the fact, pay attention to other webcam indicators - the reaction to various lighting conditions, the presence of a built-in or additional microphone, the length of the connecting USB cord, the camera's ability to work "in a bundle" with popular programs for voice and video relationships (for example, Microsoft NetMeeting). And, of course, on maximum resolution: Although the picture quality of 640x480 points has long been the standard, there are models on the market with a much lower resolution threshold (many cameras cost up to $ 50 provide permission only to 352x288 points).
By the way, do you know that a good webcam can be successfully replaced by a digital camera? Most cameras can not only transmit a stream of video information on the computer, but also pull out individual frames and pictures from this stream. But their future fate depends on the quality of the camera: dear models can save images in the built-in memory without requiring permanent connection To the computer, the more cheap are forced to immediately discard all your "cargo" to the hard disk.
Although, of course, the real digital camera works much better, and the quality gives the other ... especially since many digital medium price categories can also, if necessary, work and webcams.
And last. Almost all camera models released after 1999 are connected to the computer through the USB connector and do not require an additional power source.
Questions for fixing:
What does "Personal Computer" mean?
2. What is the "Basic PC Configuration"?
3. What types of monitors do you know?
4. What is the resolution of the mouse?
5. What is the difference between optoe-mechanical and optical mice?
6. What other information entry devices to the computer do you know?
4. Homework: Tutorial: §2. (p.10)
Know what the basic configuration of the PC, computer device. Students having computers at home, continue to master the "blind decadent print method".
Additional task: Find information about additional devicesconnected to a computer.
5. Questions of students.
Answers to students' questions.
6. The result of the lesson.
Summing up lesson. Estimation.
In the lesson, we learned what basic PC configuration, which devices are included in the basic configuration of the PC.
