# Ohms Law Calculator

Calculate voltage/current/resistance/power.

Enter 2 values to get the other values and press the Calculate button:

## Ohm's law calculation formula

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

*I*=

*V*

*R*

Example

*I*=

20V10Ω

= 2AThe power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):

*P* = *V* × *I*

Example

*P* = 20V × 2A = 40W

## AC Ohm's law calculator

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

## AC Ohm's law calculation 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):

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

*θ*)

_{I}