Ohm's law calculator
Calculate voltage, current, resistance and power using Ohm's law - enter the two known values.
Power (P)
36 W
Voltage (V)12 V
Current (I)3 A
Resistance (R)4 Ω
Power (P)36 W
Calculations are based on Estonia's tax rates in force for 2026. Results are informational.
Last updated: 2026-06-03
What is Ohm's law?
Ohm's law relates voltage, current and resistance: U = I × R. Power is P = U × I. Knowing two values, you can find the rest.