The photograph shows a torch with batteries that are recharged by shaking the torch.
Inside the torch is a coil of wire and a magnet that can move freely through the coil in
alternate directions when the torch is shaken. The coil is connected to a rechargeable
Explain how shaking the torch produces an electric current.
Explain, with reference to Lenz’s law, how the magnet does work as it enters the coil
The circuit in the torch contains a diode between the coil and the battery.
Explain why the diode is needed if the battery is to charge.