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to calculate:

1hp=745W

3hp=745*3=2.2Kw

assuming a 3 phase motor

power is V*I*pf*the square root of 3

I would gues a PF of 0.8 if its a resonable motor which gives about 7.2 amps per phase.

if the PF is bad say .65 it could pull up to 9 amps

in short, too little information to give you the actual answer.

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15y ago
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10y ago

A half horsepower motor draws between 2.3 & 3.2 amps at 220 Volts depending on the efficiency.

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Q: How many amps does a half horse power motor draw at 220 Volts?
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How do you calculate hp from amps?

1 HP is 746 watts in principle. The power is in watts, and the power is the volts times the amps. For an AC motor the power is the volts times the amps times the power factor times a factor that depends on the power-conversion efficiency of the motor.


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depends what the source voltage isone horsepower equals to 746watts (assuming 100% efficiency)746 watts divided by voltage source equals current (amps)AnswerIn countries, such as the USA, where the horsepower is still used as a means of measuring power, it is always used to measure the output power of a motor.So, in order to determine the current drawn by the motor, you will first need to find out its input power. The input power is the output power divided by the machine's efficiency. Once you know its input power, then you can find its current by dividing the input power by the supply voltage. In practise, you will need to use a wattmeter to determine its input power.


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Using 120 volts at 12 amps is the same power as what amps at 220 volts?

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