Four electric winches each lift a load at a steady speed. The table shows the total power input and the useful power output of each winch.
| Winch | Total power input (W) | Useful power output (W) |
|---|---|---|
| 1 | 400 | 160 |
| 2 | 800 | 360 |
| 3 | 600 | 300 |
| 4 | 250 | 120 |
Which winch has the highest efficiency?
Winch 4
Winch 1
Winch 2
Winch 3
104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.