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?
In case 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).