Four electric cranes lift loads at a construction site.
The table shows the work done by the motor of each crane and the time taken.
Which crane's motor produces the most power?
| Crane | Work done / J\text{J}J | Time taken / s\text{s}s |
|---|---|---|
| A | 45 00045\,00045000 | 15 |
| B | 90 00090\,00090000 | 15 |
| C | 45 00045\,00045000 | 30 |
| D | 90 00090\,00090000 | 30 |
Crane A
Crane B
Crane C
Crane 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.