A bicycle horn contains a battery, a buzzer and a push switch connected in series. The buzzer sounds only while the switch is held down. Which statement explains why the buzzer stops when the switch is released?
The resistance of the circuit falls to zero, so the battery cannot push charge
The circuit is broken, but charge still flows between the battery and the switch
The circuit is broken, so the current is zero at every point in it
Charge piles up at the open switch, so none of it reaches the buzzer
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.