An electric motor under steady load draws 9.7 amperes at 110 volts; it delivers 1.25 (hp) of mechanical energy. The temperature of the surroundings is 300 K. What is the total rate of entropy generation in W·K-1?

Question

Engineering

Moocher

16 January, 20:51

An electric motor under steady load draws 9.7 amperes at 110 volts; it delivers 1.25 (hp) of mechanical energy. The temperature of the surroundings is 300 K. What is the total rate of entropy generation in W·K-1?

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Answers (1)

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Jaylin Freeman · Answer 1

The total rate of entropy generation is 6.665 W/K

Explanation:

Power input = current * voltage = 9.7 * 110 = 1067 W

Power output = 1.25 hp = 1.25 * 746 = 932.5 W

Total power = 1067 + 932.5 = 1999.5 W

Total rate of entropy generation = total power : temperature of the surrounding = 1999.5 W : 300 K = 6.665 W/K