Ohms Law Calculator

Ohm's Law Calculator

Calculate voltage/current/resistance/power.

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

Voltage divider calculator ►


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 = 20V / 10Ω = 2A

The 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:

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

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|) ∠ (θI + θZ)

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|) ∠ (θV - θI)

 

Ohm's law ►

 

See also

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