Physicshard · Past Paper
A motor is 80% efficient and is supplied with 2kW. How much mechanical power does it output?
A2.5 kW
B1.6 kW
C0.8 kW
D2.0 kW
✓ Correct Answer: B — 1.6 kW
Output power = Efficiency * Input power = 0.80 * 2000W = 1600W = 1.6kW.
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