## DC watts to amps calculation , chart and formulas

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 |

Fluorescent 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 |