Ohm's law calculator
Calculate voltage, current, resistance, and power for electrical and electronic circuits. Solves all unknown values from any two known metrics.
Circuit input parametersDC / Pure resistive AC
V
Ω
Voltage (V)12Volts
Current (I)0.05Amps
Resistance (R)240Ohms (Ω)
Power (P)0.6Watts
V = I × R • P = V × I
How it works
1
Select known values
Choose which two circuit parameters you know (e.g. voltage and resistance).
2
Ohm's formula applied
Calculates the remaining electrical variables using V = I × R and P = V × I.
3
Instant quadrant specs
Voltage (V), Current (A), Resistance (Ω), and Power (W) solve in real time.
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