Watts = Amps x Volts x Power Factor.
Power Factor = 1 for resistive loads and gets smaller for inductive loads like motors.
Assuming home voltage of 120 Volts and a PF = 1 your answer is 400/120 = 3.33 amps.
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To convert watts to amps, you can use the formula: Amps = Watts / Volts. Assuming a standard voltage of 120V, 400 watts would be equivalent to approximately 3.33 amps.
Multiplying 400 volts by 45 amps would give you a power output of 18000 watts, which is equivalent to 18 kilowatts (kW).
One ampere (A) at 400 volts (V) is equal to 400 watts (W). This is because power (in watts) is calculated by multiplying voltage (in volts) by current (in amperes). So, in this case, 1A x 400V = 400W.
The conversion of watts to amps at a fixed voltage is governed by the equation Amps = Watts/Volts for example 12 watts/12 volts = 1 amp for a US example, a food mixer with a 400 watt motor on a 120 volt supply 400/120 = 3.33amps, fit a 5amp fuse
To calculate the amperage, you can use the formula: Amps = Watts / Volts. In this case, a 400-watt heater cartridge at 240 volts would draw 1.67 amps.
For calculation purposes there are 746 watts in one horsepower.