Revise GCSE Physics

Question:What types of signal do we need to know about?

There are two main types of signal - Analogue Signals and Digital Signals.

This diagram shows you how the size of an analogue and a digital signal changes as time passes.

Analogue and digital signals

Notice that for the Analogue signal the size of the signal (its value) varies continuously, while the size of the Digital signal is either 1 or 0 only.