The table shows the time taken by four different cranes, A, B, C, and D, to lift loads to the roof of a building. All four cranes lift their respective loads through the same vertical height.
| Crane | Mass of load (kg) | Time taken (s) |
|---|---|---|
| A | 1200 | 20 |
| B | 1200 | 30 |
| C | 1800 | 20 |
| D | 1800 | 30 |
Which crane has the greatest power output?
A
B
C
D
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.