⚛ Ohm's Law Calculator

Ohm's Law, calculates the relation between Voltage,
Current and Resistance. Enter 2 values to get the third value.

Resistance (R):

Ohms (Ω)

Current (I) :

Amps (A)

Voltage (V):

volts (V)


Ohm's Law

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship .
The voltage V in volts (V) is equal to the to the current I in amps (A) times the resistance R in ohms (Ω):
V = I x R
The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A):
R = V / I


Ohm's Law Calculation

The resistor's current I in amps (A) is equal to the resistor's voltage V in volts (V) divided by the resistance R in ohms (Ω)
I = V / R


Calculator