Each component makes something happen using electricity. The picture above shows a circuit with a bulb and a battery cell in. The diagram next to it shows the symbols for each of these components.

In this circuit it’s nought point two three ... by connecting the leads of the voltmeter on each side of the component. The diagram below shows how a voltmeter can be connected to measure ...

Fastest finger first indicators (FFFIs) bring precision to quiz games, measuring contestants’ reaction times with accuracy.