A student tests three electric motors, A, B and C.
The Table shows the energy transferred by each motor and the time taken.
Table
| Motor | Energy transferred in J\text{J}J | Time taken in s\text{s}s |
|---|---|---|
| A | 6000 | 20 |
| B | 4500 | 10 |
| C | 9000 | 40 |
Calculate the power of motor A.
The student says:
'Motor C is the most powerful because it transfers the most energy.'
Explain why the student is wrong.
Calculate the time it would take motor B to transfer 9000 J of energy.
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.