Revise GCSE Physics

Question:Why is Morse code a digital code?

This sometimes confuses students.

A digital signal only takes on two values , but Morse Code use dots, dashes and spaces.

This does not mean that the signal has three values.

When morse code is sent the dot is represent by a short 'on' value and the dash is represented by a longer 'on' value and both are separated by spaces, which are the 'off' values.

What is being turned 'on' and 'off' depends on the system being uses. It could be a light being flashed on and off, which was used to communicate between ships. Or a voltage being turned on and off or a radio signal being turned on and off etc..