a motor is rated at 15 HP (assume it is a 1 phase motor). if it runs on 230 v an

Question

a motor is rated at 15 HP (assume it is a 1 phase motor). if it runs on 230 v and it is 95% efficient, how many watts does it draw from the power line and how many amperes of current is lost by the motor?

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Explanation / Answer

power rated = 15 HP; power produced by motor = 15 Hp = 15 * 745.699872 = 11185.4981 watts; current out = 11185.4981 / 230 = 48.6326004 amps motor is 95% efficient ==> power out / power in = .95 ==> power in = power out / .95 = 11185.4981/0.95 = 11774.2085 watts; power drawn from line = 11774.2085 watts; power in = volatge * current ==> current drawn = 11774.2085 / 230 = 51.1922109 amperes current lost = 51.1922109 - 48.6326004 = 2.5596105 amperes

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