How to convert electric current in amps (A) to electric power in watts (W).

You can calculate watts from amps and volts. You can't convert amps to watts since watts and amps units do not measure the same quantity.

The power *P* in watts (W) is equal to the current *I* in amps (A), times the
voltage *V* in volts (V):

*P*_{(W)} = *I*_{(A)}* *×* V*_{(V)}

So watts are equal to amps times volts:

watt = amp × volt

or

W = A × V

What is power consumption in watts when the current is 3A and the voltage supply is 110V?

Answer: the power P is equal to current of 3 amps times the voltage of 110 volts.

*P* = 3A × 110V = 330W

The real power *P* in watts (W) is equal to the power factor *PF* times
the phase current *I* in amps (A), times the RMS voltage *V* in volts (V):

*P*_{(W)} = * PF *×* I*_{(A)}* *×* V*_{(V)}

So watts are equal to power factor times amps times volts:

watt = * PF *×* *amp × volt

or

W = * PF *×* *A × V

What is power consumption in watts when the power factor is 0.8 and the phase current is 3A and the RMS voltage supply is 110V?

Answer: the power P is equal to power factor of 0.8 times current of 3 amps times voltage of 110 volts.

*P* = 0.8 × 3A × 110V = 264W

The real power *P* in watts (W) is equal to square root of 3 times the power factor *PF* times the
phase current *I* in amps (A), times the line to line RMS voltage *V*_{L-L} in volts (V):

*P*_{(W)} = *√*3
× * PF *×* I*_{(A)}* *×* V*_{L-L(V)}

So watts are equal to square root of 3 times power factor PF times amps times volts:

watt = *√*3
× * PF *×* *amp × volt

or

W = *√*3
× * PF *×* *A × V

What is power consumption in watts when the power factor is 0.8 and the phase current is 3A and the RMS voltage supply is 110V?

Answer: the power P is equal to power factor of 0.8 times current of 3 amps times the voltage of 110 volts.

*P* = *√*3
× 0.8 × 3A × 110V = 457W

The calculation assumes the loads are balanced.

The real power *P* in watts (W) is equal to 3 times the power factor *PF* times the phase current
*I* in amps (A), times the line to neutral RMS voltage *V*_{L-0} in volts (V):

*P*_{(W)} = 3 × * PF *×* I*_{(A)}* *×* V*_{L-0(V)}

So watts are equal to 3 times power factor PF times amps times volts:

watt = 3 × * PF *×* *amp × volt

or

W = 3 × * PF *×* *A × V

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