Kilowatts = (Torque * RPM) / 9549. It's much simpler to work out how 9549 constant came to being for the metric one. We need to convert RPM to Rad/s, and the Power is Kilowatts not just Watts, so there is the difference of 1000 times as well. So 1 rpm / 60 = rps = 0.01666 * 2PRad = 0.1047 Now 1000/0.1047 = 9549.29
How to Convert Horsepower to Amps. Horsepower (HP) is a measure of electric power equal to 746 watts (W). Converting horsepower to amps can be done in a few simple steps, or using this simple formula.