How to convert Amps to Watts

DC Amps to watts calculation formula

P(W) =I(A) × V(V)

The power P in watts (W) is equal to the phase current I in amps (A), multiplied by the voltage V in volts (V).

So,

W = A x V
watts = amps x volts

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V

Power (P) = 2,5A x 110V = 275W

AC single phase Amps to watts calculation formula

P(W) = PF × I(A) × V(V)

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

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So,

W = PF x A x V
watts = PF x amps x volts

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V
PF = 0,7

Power (P) = 0,7 x 2,5A x 110V = 192,5W

AC three phase Amps to watts calculation formula

Line to line voltage

P(W) = √3 × PF × I(A) × VL-L (V)

The real power P in watts (W) is equal to square root of 3, multiplied by the power factor PF, multiplied by the phase current I in amps (A), multiplied by the line to line RMS voltage VL-L in volts (V).

So,

W = √3 x PF x A x V
watts = √3 x PF x amps x volts

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V
PF = 0,7

Power (P) = √3 x 0,7 x 2,5A x 110V = 333,4W

Line to neutral voltage

P(W) = 3 × PF × I(A) × VL-N (V)

The real power P in watts (W) is equal to 3, multiplied by the power factor PF, multiplied by the phase current I in amps (A), multiplied by the line to neutral RMS voltage VL-N in volts (V).

So,

W = 3 x PF x A x V
watts = 3 x PF x amps x volts

For example:

Phase current (I) = 2,5A
Voltage (V) = 110V
PF = 0,7

Power (P) = 3 x 0,7 x 2,5A x 110V = 577,5W

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