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):
Current (I):
Voltage (V):
Power (P):
   
Impedance (Z): ° = 
Current (I): °  
Voltage (V): °  
Power (S): ° = 
     

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)

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