Online ohm's law calculator: calculates voltage / current / resistance / power.

### Ohm's law calculator

Enter **2 values** to get the other values and press the

*Calculate*button:

### AC Ohm's law calculator

Enter **2 values** of magnitude+phase angle to get the other values and press the

*Calculate*button:

### Ohm's law formula

The voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Ω):

*V*_{(V)} = *I*_{(A)} × *R*_{(Ω)}

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

*P*_{(W)} = *V*_{(V)} × *I*_{(A)}

## AC Ohm's law formula

The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω):

*V*_{(V)} = *I*_{(A)} × *Z*_{(Ω)} = *(|**I**|*×*|**Z*|) ∠ (*θ _{I}* +

*θ*)

_{Z}The complex power S in volt-amps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):

*S*_{(VA)} = *V*_{(V)} × *I*_{(A)} = *(|**V**|*×*|**I*|) ∠ (*θ _{V}* -

*θ*)

_{I}

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