Computer is an electronic device that receives data as input, processes using processing device and stores data and gives the desired output. The Basic structure of a computer includes various units such as input, output, storage and processing device to perform arithmetic and logical operations.
A.1 Input Devices
Computer needs input to perform a particular task. Information or data that is entered into the computer using Input device is called as Input. Input device is the computer unit that sends data and set of instructions to the computer system. The computer accepts the set of instructions in the form of coded information which the computer understands. A computer would simply be a display device without an input device.
Fig A.1 Mouse
The most commonly used input devices are keyboard, mouse and scanner. The keys pressed on the keyboard provide information as input to the computer. Whenever a key is pressed, the corresponding letter or digit is automatically translated into its corresponding binary code and transmitted over a cable to the memory or processor. Some more examples of input devices are joystick, trackball, light pen, web cameras, and microphones.
Fig A.2 Keyboard
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