# Ohm’s Law calculator

## Ohm’s Law calculator

We are offering the Online ohm’s law calculator, to help you calculate the value of voltage / resistance / current or power.

## Ohm’s law calculator

All you need is to enter the 2 values to obtain the other values and then hit the = button to calculate.

 Resistance (R): ohms (Ω) kiloohms (kΩ) megaohms (MΩ) Current (I): microamps (μA) milliamps (mA) amps (A) kiloamps (kA) megaamps (MA) Voltage (V): microvolts (μV) millivolts (mV) volts (V) kilovolts (kV) megavolts (MV) Power (P): microwatts (μW) milliwatts (mW) watts (W) kilowatts (kW) megawatts (MW)
 Impedance (Z): Ω kΩ MΩ ∠ ° = Current (I): μA mA A kA MA ∠ ° Voltage (V): V kV MV ∠ ° Power (S): VA kVA MVA ∠ ° =

## AC Ohm’s law calculator

All you need is to enter the 2 values of magnitude+phase angle to get the other values and press the Calculate button.

Tool

## Ohm’s law formula

The value of voltage V measured in volts (V) is apparently equal to the value of current I in amps (A) multiplied by the resistance R measured in ohms (Ω).

V(V) = I(A) × R(Ω)

The power P measured in watts (W) is apparently equal to the value of voltage V in volts (V) multiplied by the current I measured in amps (A).

P(W) = V(V) × I(A)

## AC Ohm’s law formula

The voltage V in volts (V) is apparently equal to the value of current I in amps (A) multiplied by the impedance Z in ohms (Ω).

V(V) = I(A) × Z(Ω) = (|I|×|Z|) ∠ (θI + θZ)

The complex power S measured in volt-amps (VA) is apparently equal to the value of voltage V in volts (V) multiplied by the current I measured in amps (A).

S(VA) = V(V) × I(A) = (|V|×|I|) ∠ (θV – θI)