How a torch works

Screen 7/10

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: What holds the batteries firmly to the bulb?

[Answer]

A torch is a simple circuit just like the ones we've been using.

In this case the circuit has been reshaped to make it portable and robust.

It shows that it doesn't matter what shape the circuit is, just so long as all the parts are in a loop.