Ohm’s law states V = I × R, where V is voltage in volts, I is current in amps and R is resistance in ohms. A 12V circuit drawing 2A has 6 ohms of resistance.
Ohm’s law states V = I × R, where V is voltage in volts, I is current in amps and R is resistance in ohms. A 12V circuit drawing 2A has 6 ohms of resistance. Our ohms law calculator is built on the same core ohms law voltage calculator current calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
The Fundamental Ohm's Law Circle: V = I × R
Voltage (V in volts) equals Current (I in amperes) multiplied by Resistance (R in ohms). Power (P in watts) equals V × I or I² × R.
Solving for Unknown Circuit Variables
Enter any two known values (e.g. Voltage and Resistance) to automatically compute the remaining electrical properties and dissipated power.
Practical Electronics and DIY Applications
Use to calculate required current-limiting resistor values for LEDs, power supply sizing, and domestic wiring loads.
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