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A three-phase 12 HP motor is 90% efficient with a .89 lagging power factor. What is the required rated input apparent power for this motor running under full load?
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A three-phase 12 HP motor is 90% efficient with a .89 lagging power factor. What is the required rated input apparent power for this motor running under full load?

User Amit Gaud
by
6.0k points

1 Answer

5 votes

Answer:

The required rated input apparent power is 14.98 HP

Step-by-step explanation:

Real power input = real power output ÷ efficiency

real power output = 12 HP

efficiency = 90% = 0.9

Real power input = 12 ÷ 0.9 = 13.33 HP

Apparent power input = real power input ÷ power factor = 13.33 ÷ 0.89 = 14.98 HP

User Rmmoul
by
5.9k points
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