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):

### DC watts to amps calculation

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)}

### AC single phase watts to amps calculation

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.

### AC three phase watts to amps calculation

#### Calculation with line to line voltage

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.

#### Calculation with line to neutral voltage

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.

### Typical power factor values

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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