21. 1. 13. 7. 8. 5. 16. 15. 11. 24. 20. 23. 4. 9. 6. 14. 19. 18. 17. 12. 10. 22. 3. 2. Central Processing Unit (CPU). The Central Processing unit or CPU holds programs in its memory and co-ordinates the running of the whole computer. It also carries out data processing.
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The Central Processing unit or CPU holds programs in its memory and co-ordinates the running of the whole computer. It also carries out data processing.
The motherboard pieces everything in the computer together and lets them communicate. The first motherboards came in the IBM PC and it only had a processor and card slots.
The microphone is a acoustic to electric device. It is used by singers and announcers. It sends a wired or wireless sounds to speaker which then make it louder.
The Graphics tablet is a device that lets the user write or draw like on a piece of paper. It can also be used for capturing signatures.
The optical drive uses laser-light or electromagnets to read or write data. Older versions can only read from disks but newer versions can write on them as well.
The Hard disk drive is the main and largest storage device in the computer. It has the power to save storage even when the power is off. The hard drive is the size of a paperback but much heavier.
RAM is the best known type of computer memory. It is ‘Random access’ meaning you can access any memory cell if you know the row and column that the memory cell is in. The RAM stores the data up on the screen, so when you close a page it is wiped from the RAM.
The graphics card is a device that controls the quality of the picture on the screen. Another name for it is the display adapter. The Graphics Card contains a large quantity of RAM and can support different types of monitor display.
The touch screen is a heat sensitive device it senses the heat change and selects where the heat has changed. The surface acoustic wave or SAW uses ultrasonic waves that pass over the touch panel. When the panel is touched the wave is absorbed, the change in waves results in the controller sending a signal to where the screen is being touched.
The data projector is widely used within classrooms and auditoriums for lectures and slide-shows. LCD projectors use three LCD panels each reproducing red, blue and green to recreate a full spectrum of colours based on how much light passes through the liquid crystals.
The sound card improves the sound quality of games and multimedia apps. Additional packaged software allows users to make, edit, print and record music and play audio and multimedia CDs
A card reader is a device that reads data from card shaped storage. The first were punched card readers they read punched cards and were used during the first decades of computing. The modern card reader reads bar-codes, magnetic strips and computer strips.
Monitors are one of the most important part of the computer, it allows the user to see what the computer allows. The smaller of monitors are around 17 - 19 inches measured diagonally and the bigger ones are about 22 – 24 inches diagonally. The two main types of monitors are TFT (thin film transistor) and CRT (cathode ray tube).
The keyboard was based on the typewriter. It came in around in the 1970s when the growth of data storage began. The keyboard has typewriter style keys and are used to enter data into the computer.
The mouse was invented by Douglas Englebart and Bill Englishin the early 1960s. They wanted to make a more efficient way to interact with the computer screen. The mouse sends information through a click to the screen.
The power supply unit converts AC mains to low voltage DC power for the internal components of the computer. A test in 2005 said that PSUs are generally 70-80% efficient.
Even though most of the computer output is visual you still need speakers to watch videos and to play games or if you need a sound cue or notifications. Most computers have built-in speakers but they might only be able to emit small sounds, so most people will buy their own speakers for a wider range of sound.
The first ink Printer came into existence in 1976 and laser printers were invented later on. Laser printers use toner (dry ink), heat pressure and light to put the ink on the paper. Ink printers use ink cartridges which spray tiny drops of ink on the paper in a specific pattern.
Scanners are devices that bounce light against an image and then make it a computer image. The physical characteristics of scanners fall into 2 categories. The Flatbed scanners operate much like a copying machine, having a movable light source, while the scan image is placed atop on a glass surface.
Awebcam is a video camera that sends a live video to a computer using USB. The webcam was first developed in 1991 and was pointed at the Trojan room coffee pot in Cambridge University and it was turned off in 2001. The oldest webcam still running is the Fog Cam in the San Francisco university, it started running in 1994.
A router is a device that lets multiple computers use internet. It allows us to use e-mail, Google and basically everything else that requires internet.
The ROM is a built in computer memory that can only be read. The ROM allows the computer to be turned on. The data in the ROM is never lost when the computer is turned off. It can also be known as the boot-strap loader.
SD card were introduced in 1999 by Panasonic, Toshiba and SanDisk.SD Cards can be up to 128gb.
The ‘SD’ means Secure Digital and it’s full name is ‘Secure Digital Memory Card’.
Flash Drives are solid state storage devices that are plugged in using the computer’s USB plug.
Flash Drives don’t need a battery to be used, they will just use some of the computers energy.
The flash drive is very shock resistant especially in comparison to the Hard Drive.
By David Muir