1.Functions of a computer
2.Total computer system
3.Types of computers
1. Functions of a Computer
what is a computer ?
a machine that can follow instructions to process data in a desirable way and perform at least some operations without human intervention
there are three basic functions available on a computer
1.input
2.processing
3.output
INPUT
input is the first stage of computing,referring to any means that moves data(information)from the outside world into the processor or from one component of the computer to another..
example:-any information entered into a computer is called as input
PROCESSING
processing is the second stage of computing.this is the actual manipulation of data by the computer..
example:-the execution of program instructions by the computers central processing unit (CPU)transforms data into the information.
OUTPUT
output is the third stage of computing.all the input and processing in the world won't do us any good unless we can get the information back from the computer in a comprehensible and usable form.
example:-the process of displaying or printing the results of processing operations is the output.
2.Total Computer System
Total computer system consist of four main parts.
1.Hardware
2.software
3.Liveware
4.Firmware
(Hardware)
The physical devices of a computer system that can be touched or tangible are called computer hardware.
(Software)
A set of instructions (programs)that drive the hardware of a computer system.
(Liveware)
The person who operates the hardware through the software
(Firmware)
Also software which is stored inside the hardware
example:-Boot strap program (which is loaded at the start up)
3.Computer Hardware
Pc Hardware equipment involved in the function of a computer.computer hardware consists of the components that can be physically handled.based on the functions of the components are typically divided into three main categories
Input devices :- mouse,keyboard,scanner
output devices :- monitor,printer,speaker
storage devices :- hard disk,floppy.pen drive
