How to convert Watts to Amps

DC watts to amps calculation formula

I(A) = P(W) / V(V)

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

So,

A = W / V
amp = watt / volt

For example:

Power (P) = 220W
Voltage (V) = 110V

Phase current (I) = 220W / 110V = 2A

AC single phase watts to amps calculation formula

I(A) = P(W) / (PF × V(V))

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

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So,

A = W / (PF x V)
amp = watt / (PF x volt)

For example:

Power (P) = 220W
Voltage (V) = 110V
PF = 0,7

Phase current (I) = 220W / (0,7 x 110V) = 2,86A

AC three phase watts to amps calculation formula

Line to line voltage

I(A) = P(W) / (√3 × PF × VL-L(V))

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

So,

A = W / (√3 × PF x V)
amp = watt / (√3 × PF x volt)

For example:

Power (P) = 220W
Voltage (V) = 110V
PF = 0,7

Phase current (I) = 220W / (√3 × 0,7 x 110V) = 1,65A

Line to neutral voltage

I(A) = P(W) / (3 × PF × VL-N(V))

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

So,

A = W / (3 × PF x V)
amp = watt / (3 × PF x volt)

For example:

Power (P) = 220W
Voltage (V) = 110V
PF = 0,7

Phase current (I) = 220W / (3 × 0,7 x 110V) = 0,95A

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