QUICK QUESTIONS WITH ANSWERS FOR REFERENCE

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti   Optical disks The Compact Disc or CD for short, is an optical disc used to store digital data. It was originally developed to store and play back sound recordings only, but the format was later adapted for storage of data (CD-ROM), write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Discs (VCD), Super Video Compact Discs (SVCD), Photo CD, Picture CD, CD-i, and Enhanced CD. Audio CD's and audio players have been commercially available since October 1982. Have a storage capacity of 700MB or 80 minutes of continuous play.

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti Secondary storage devices These are devices that store data permanently. They are classified into two categories namely: Magnet and Optical disks.

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti PROCESSING DEVICES THE CENTRAL PROCESSING UNIT(CPU) The CPU also known as the processor is mounted on the system board (mother board) inside the system unit. It’s regarded as the brain of the computer because it does all the processing activities in the computer. The figures below shows the top and bottom view of a the CPU respectively.

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti  The computer Lab and the Keyboard   Review questions How does a computer differ from a calculator? List any three safety precautions one should observe when entering a computer lab

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti 3. Scanning Devices -These are devices that capture data directly into the computer. -They can also be defined as devices that use a magnetic or photo-electric source to scan and convert images into electric signals that can be processed by an electronic apparatus, such as a computer.

Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com - Author: Atika M. Nyamoti 2. Pointing Devices these are devices used to control the pointer/cursor on the screen. Examples: mouse, joystick, trackball, light pen etc    The Mouse there are different types of mice namely: ps/2, optical, wireless/cordless etc  

Powered by www.manyamfranchise.com - Created by: M.A Nyamoti   Summary of keyboard keys and uses

Powered by www.manyamfranchise.com - Created by: M.A Nyamoti   Computer systems computer system

Powered by www.manyamfranchise.com - Created by: M.A Nyamoti The computer laboratory A computer lab is a room set aside for installation and use of computers. Safety precautions and practices in the computer lab Computer systems are expensive to acquire and maintain, and should therefore be handled with care. Causes of computer damage and measures to avoid them Dust and Smoke-   dust and smoke damage the surface of the hard disk and other sensitive parts. To avoid them:

Powered by www.manyamfranchise.com - Created by: M.A Nyamoti  Introduction to Computers Quiz Exercise questions 1.   What are the different parts that make up a computer? 2.   CPU stands for? 3.   What is a Modem? What is it used for? 4.   Data that has been processed and has meaning is referred to as?

Powered by www.manyamfranchise.com - Created by: M.A Nyamoti  Introduction to Computer Answers 1.   What are the different parts that make up a computer? Mouse, Keyboard, System Unit, Screen(Monitor/VDU-Visual Display Unit) 2.   CPU stands for? Central Processing Unit 3.   What is a Modem? What is it used for? A modem is made from these two words: Mod ulation and Dem odulation this means converting digital signal into analogue for transmission and vice versa.

Powered by www.manyamfranchise.com Created by: M.A Nyamoti Areas where computers are used Just like all other machines, computers are used in a day-to-day life to make work easier and more efficient. Some important application areas of a computer are given below.

2.   Classification according to functionality

Powered by www.manyamfranchise.com Created by: M.A Nyamoti   Classification of computers   Computers can be classified according to physical size, functionality and purpose as shown in the organizational chart below