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22-09-2019
Physics

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the useful power out of an electric motor is 20w and the total power into the motor is 80w calculate the percentage efficiency of the motor

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MathPhys MathPhys

22-09-2019

Answer:

25%

Explanation:

Efficiency is the ratio of power out to power in.

e = 20 W / 80 W

e = 0.25

The motor is 25% efficient.

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