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One hp is about 750 watts. Power divided by volts equals amps. 750/120=6.25 amps.
Answer 2
But this answer takes no account of what the voltage is. It makes the assumption that it is 120 volts. But the various mains in Europe run at about 240 volts. And what about other voltages, eg 12 volts from a car battery? You'd need 65 amps in this case - rather like a car starter motor.
Answer 3
The conversion from watts to hp is indeed 1hp = 746 watts (as stated above), but no motor is 100% efficient, so you will never actually find a 1hp motor that draws only 746 watts. Real-world 1hp motors draw somewhere between 1,000 and 1,500 watts. Also answer #2 is correct, you need to know volts to calculate amps, but both answers 1 and 2 are only applicable for single phase motors, the formula is different for 3-phase motors.
Further complicating things, volts times amps actually equals VA (volt-amperes) not watts. You must multiply VA times power-factor to get true watts.
So, to get an accurate answer, you must simply consult the nameplate of the chosen motor where the amps are directly listed. If you need an approximation the following formulae will get you close (they assume 1,200 VA per hp):
Single Phase:
Amps = 1200 / nameplate volts
Three phase:
Amps = (1200 / nameplate volts) / 1.73
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∙ 11y ago
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