Electric power in watts (W) to electric current in amps (A) calculator.

Select current type, enter
power in watts,
voltage in volts,
power factor for AC circuit and press the *
Calculate* button (DC = Direct Current, AC = Alternating Current):

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

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

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

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

The power factor of resistive impedance load is equal to 1.

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

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

The power factor of resistive impedance load is equal to 1.

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

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

The power factor of resistive impedance load is equal to 1.

Do not use typical power factor values for accurate calculations.

Device | Typical power factor |
---|---|

Resistive load | 1 |

Fluorecent lamp | 0.95 |

Incandescent lamp | 1 |

Induction motor full load | 0.85 |

Induction motor no load | 0.35 |

Resistive oven | 1 |

Synchronous motor | 0.9 |

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