A relay uses a small current in one circuit to switch on a large current in a second circuit. Which explains how the relay works?
The coil becomes an electromagnet and attracts an iron armature, closing the contacts
The coil becomes an electromagnet and repels an iron armature, closing the contacts
The coil warms an iron armature until it expands enough to close the contacts
The coil passes its own current on to the second circuit through the contacts
39 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.