An electric kettle is plugged into the mains and switched on.
How is energy transferred from the mains to the kettle?
Choose your answer from the list.
by electric current by forces by heating by radiation
Name the energy store of the water that increases when the kettle is switched on.
The kettle has a power rating of 2000 W.
State what this power rating tells you about the kettle.
Some of the energy transferred to the kettle is wasted.
State what happens to this wasted energy.
50 exam-style questions on OCR GCSE Physics 7.2 Power and efficiency, covering 7.2.1 Dissipation of energy, 7.2.2 Energy transfers in domestic devices, 7.2.3 Power ratings of domestic appliances, 7.2.4 Efficiency of energy transfers, 7.2.5 Ways to increase efficiency, 7.2.6 Reducing unwanted energy transfers, and 7.2.7 Thermal conductivity and the cooling of buildings. Each one has a worked solution and a mark scheme showing where the marks go.