Friday, 30 September 2011


In a computer:
• Keyboard and the mouse are input devices
• Monitor and the printer are output devices
• The system unit is responsible for all the processing required to convert the input to the desired output
• The system unit can perform all kinds of arithmetic and logical operations
Motherboard 
 It is a part of the system unit and houses several vital components of the computer 
• Microprocessor
– It is the most important component of the motherboard that performs the actual processing of data, that is, the arithmetic or logical operations on the given data
• A large board in the system unit
• Has a number of tiny electronic circuits and other components
• The microprocessor is the most important component of the motherboard
Video Card 
Plugs into a personal computer to give it display capabilities.
• Plugs into a personal computer to give it display capabilities
• It enables the representation of data in a visual form
• It provides digital-to-analog conversion 
Sound Card 
A device in the system unit that enables a computer to accept, process and play sound
• It is a device in the system unit
• It enables a computer to accept, process and play sound
• It enables a computer to record sound from a microphone
• It manipulates sound stored on a disk and the sound is given as output through speakers
 Remember This

• In the late 1980s, a computer cost almost 1 lakh rupees
• Today, a world class branded computer can be purchased for about Rs. 15,000/-
• Previously, only the higher secondary schools were able to afford computer laboratories
• Today, computer education is introduced at the primary level in many institutions

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