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Lets see how a computer works? A computer performs its
function in tree steps
Input ---------------process ---------output
Input – every time you want the computer to do something,
you have to tell the computer what to do. The required information or data and
the instructions about what to do, are the INPUT to the computer.
Process – The process that the computer does on the input
data, goes on in the main part of the computer called central processing unit
(CPU) .It has two main areas –the memory and the work area.
Output –The result obtained by the computer is the OUTPUT.
Primary Memory – Suppose you the data and a set of 10
instructions to the computer. It carries out the instructions one by one on the
data and gives you the result .To do this computer must ‘remember’ the 10
instructions and the order in which they should be carried out.
The same way we remember words, faces, names or whatever we
read because we have a memory. The memory is the power to remember. A computer also
has a memory. It can remember data and instructions. It keeps them in its
memory. The memory of a computer works
on electricity. It is lost when the computer is switched off .For this reason
it is called temporary memory or primary memory.
Secondary memory –storage device
Suppose you make a long program for doing something and type
it into the computer. It goes into the primary memory. Once the computer is
switched off, the program is lost. The next time you want to use the same
program, you will have to type it again. This is waste of time and effort.
There should be therefore be devices in the computer where programs and data
can be stored permanently. Such devices are called storage devices.
Hard Disk – this is the storage device that is built as part
of a computer. It has a very large storage capacity. Other examples are CD-ROM
or Floppy disk
What goes on inside a computer?
The information and instructions received by the computer as
input are kept in its memory. When you ask the computer to do a particular job,
it first searches its memory for the set of instructions on how to do the job.
(Soft wares)
After finding the set of instructions, it starts from the
first instruction and does exactly what the instruction says. It then moves to
the second instruction and so on till it reaches the last instruction in the
set. It then produces the result called the output.
If there is any mistake in the program, the computer display
an error message and stop there. What’s the point? No I am not a computer
expert and picked up this above information from the textbook of my son who is
in fourth grade. The information is useful example of what I want to say?
Incase of human beings
Input is our five senses with the help of which we give
instructions to our mind
Mind (Hard Disk) like computer has two portions
Primary memory or conscious mind
Secondary memory or subconscious mind
Output –is our response to the input (five senses
instructions) and processor (software’s in our unconscious mind).
So if the input (outside situations in life) is same in case
of two persons there responses (output) could be different because of different
software (programming in subconscious minds of two persons).
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