1a3 marks
Photograph E shows a rechargeable torch.
(a)
When a student shakes the torch, the magnet moves through the coil and back again.
This induces a voltage across the ends of the coil.
The voltage is used to provide current to recharge the battery.
(i)
Explain why a voltage is induced.
(2)
(ii)
State one way to increase this voltage.
(1)
1b2 marks
(b)
Photograph F shows the components inside the torch.
The torch uses a light-emitting diode (LED) to provide light.
The manufacturer of the torch states that
"An LED is a more efficient source of light than a filament lamp."
Explain this statement in terms of energy transfer.
(2)
Did this page help you?