The Table shows information about three electrical appliances used in a home each day.
Table
| Appliance | Power | Time used each day |
|---|---|---|
| electric shower | 9.0 kW | 12 minutes |
| television | 120 W | 5.0 hours |
| kettle | 2.4 kW | 15 minutes |
Use the equation: energy transferred (kW h)=power (kW)×time (h)\text{energy transferred (kW h)} = \text{power (kW)} \times \text{time (h)}energy transferred (kW h)=power (kW)×time (h)
Calculate the energy transferred by the electric shower each day in kW h\text{kW h}kW h.
Show that the television transfers 0.60 kW h each day.
Electricity costs 28p for each kW h\text{kW h}kW h.
Calculate the total cost of using all three appliances for one day.
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.