An electric kettle has a power rating of 2.0 kW. It is switched on for 3.0 minutes.
Use the equation:
energy transferred=power×time\text{energy transferred} = \text{power} \times \text{time}energy transferred=power×time
How much energy does the kettle transfer?
6.0 J6.0\ \text{J}6.0 J
6000 J6000\ \text{J}6000 J
360 J360\ \text{J}360 J
360 000 J360\,000\ \text{J}360000 J
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.