A cyclist rides a bicycle fitted with a hub dynamo. When the headlight is switched on, completing the circuit, the cyclist finds that they must pedal harder to maintain the same constant speed.
Explain why it is more difficult to pedal when the dynamo is connected to the active headlight.
4 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.