write a essay about computer
Answers
Explanation:
A computer receives incoming data, processes them and produces an output.
Hence, in a typical computer, there is
(a) An input device i.e., a key board
(b) A Central Processing Unit (CPU) i.e., a box and
(c) An output device i.e., a monitor or a Visual Display Unit (VDU)
(a) Input Devices
The most commonly used input device is a key board. It is just like a type-writer keyboard. Other types of input devices are Bar-Code Recognition, Hard-Held Terminal, and Hard Print Terminal or also called data tablet, Optical Mark Reading, Magnetic Ink Character Recognition (MICR), Optical Character Reader (OCR) etc
(b) Central Processing Unit (CPU)
It has a box like appearance and is considered as the heart of the computer. It is consisted of;
(i) Control Unit (CU)
(ii) Arithmetic and Logic Unit (ALU) and
iii) Primary Storage Unit, (i) Control Unit (CU)
The control Unit organizes all the operations. It selects, interprets and executes the programme instructions, (ii) Arithmetic and Logic Unit (ALU)
It does all the arithmetic and logic operations i.e., adding, subtracting, multiplying, dividing and comparing, (iii) Primary Storage Unit
It is the memory section of CPU that stores data and programmes that are waiting to be processed or currently being processed.