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Home > Physics > Electronics > Overview



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Your study of electronics will have concentrated on the devices in your life that use electronics. Although there is a wide variety of devices which use electronics to do different jobs, they have some things in common. This revision bite includes the subject areas: input-process-output, analogue and digital outputs.

Work through them all or go to the ones that interest you. You may wish to print a hard copy for your reference.


No matter what the job of any electronic device, however simple or complicated it is, it can be thought of as three linked parts - input, process, output.

You may have seen this as a block diagram.

A block diagram showing how an electronic device can be thought of as three linked parts - input, process and output.

The input part takes in energy of some form and produces an electrical signal. The process part works on the electrical signal as necessary. The output part produces a suitable energy output from the processed electrical signal. A radio receiver has the following input-process-output parts:

A block diagram showing how a radio reciever has three linked parts - aerial (input), electronics (process) and loudspeaker (output).

Try this


1 What are the three parts of an electronic thermometer?

A block diagram showing how an electronic thermometer has three linked parts - temperature sensor (input), electronics (process) and temperature display (output)
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analogue to digital

Class Clips

Video clip explaining the differences between digital and analogue signals using CDs and vinyl records to illustrate the point.


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