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Electric power in watts (W) to electric current in amps (A) calculator.
* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12
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 factorPF times the RMS voltage V in volts (V):
I(A) = P(W) / (PF × V(V))
2.0 Watts Per Kilo
The power factor of resistive impedance load is equal to 1.
AC three phase watts to amps calculation
Calculation with line to line voltage
Watts 2 009
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 factorPF times the line to line RMS voltage VL-L in volts (V):
I(A) = P(W) / (√3 × PF × VL-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 factorPF times the line to neutral RMS voltage VL-N in volts (V):
I(A) = P(W) / (3 × PF × VL-N(V))
The power factor of resistive impedance load is equal to 1.
Typical power factor values
Watts 2.1 Expansion Tank
Do not use typical power factor values for accurate calculations.
Watts Gostt 2.0
| 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 |