A theatre is comparing two lighting systems for a rehearsal.
| lighting system | total power | time switched on |
|---|---|---|
| R | 1.8 kW | 45 minutes45\ \mathrm{minutes}45 minutes |
| S | 1.2 kW | 80 minutes80\ \mathrm{minutes}80 minutes |
Calculate which lighting system transfers less energy during the rehearsal and the difference in energy transferred by the two systems.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.