Question

An electric motor operating on 15 V supply draws a current of 5 A and yields mechanical powers of 60 W. The energy lost as heat in one hour( in KJ) is how much?​

Answer 1

Answer:

Given,

Voltage = 15V

Current = 5A

Power = 60W

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First : Find Resistance

P = I²R

R = P/I²

R = 60/25

R = 2.4 ohm

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Heat = I²RT

Heat = 25×2.4×1

Heat = 60 joules

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In KiloJoule = 60 / 1000

= 0.06 KJ