Function of Output Unit

Q11. What is the function of output unit in a computer system? Give example of some output devices.

Ans. The output unit is formed by the output devices attached to the computer. The output coming from the CPU is in the form of electronic binary signals which needs conversion in some form which can be easily understood by human beings that is, characters, graphical or audio visual. This function of conversion is performed by output units. Some popular output devices are VDU (Visual Display Unit), printer, plotter, speech synthesizer and coder etc.

Differentiate Between Input Unit and Output Unit

Q9. Distinguish between Input unit and Output unit.

Ans. The input unit is responsible for taking input and converting it into computer understandable form (the binary code). Since a computer operates on electricity, it can understand only the language of electricity that is, either ON or OFF or high voltage or low voltage. That means a computer can understand two stages ON/OFF or High/Low voltage or the binary language that uses just two symbols: 1 for ON and 0 for OFF.

The output coming from the CPU is in the form of electronic binary signals which needs conversion in some form which can be easily understood by human beings that is, characters, graphical or audio visual. This function of conversion is performed by output units.

Basic Architecture of Computer

Q4. Briefly explain the basic architecture of a computer.

Ans. Since a computer follows input-process-output cycle, the first stage is performed in computer by input unit, second stage is performed by its central processing unit and the third stage is performed by output unit. Thus the basic structure of a computer is as shown below:

Basic Architecture of Computer

Figure: Basic Structure of a Computer

The main memory holds the input and intermediate output during the processing.