Answers to GCSE Energy Transfer in Circuits
Practice Questions
1. An appliance transfers 200J of energy and a charge flows of 600mC. Calculate the potential difference that the appliance has.
600mC = 0.6C
Energy = Potential difference x charge flow
E = V x Q
V = E/Q
V = 200/0.6
V = 33v
2. A mobile phone charger will supply 450J over 1.5 minutes. Calculate the power of the mobile phone charger
1.5 minutes = 90 seconds
Power = energy/time
Power = 450/90
Power = 5W
3. Calculate the energy transferred when a potential difference of 0.25kv is applied over a time period of 4 minutes using a current of 10A.
Energy = Potential difference x current x time
E = vIt
0.25kv = 250v
4 minutes = 240 seconds
E = 250 x 10 x 240 = 600000J
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