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Ohm’s Law
Voltage, current, resistance and power.
Voltage5 V
V = I × R · Power 0.1 W
Current
Resistance
Advanced: use any two values, including power
Adjust the circuit
First value
Second value
All calculated values
Live results
- Voltage
- 5 V
- Current
- 0.02 A
- Resistance
- 250 Ω
- Power
- 0.1 W
Formula and assumptions
V = I × R · P = V × IIdeal DC/resistive loads. Enter any two different positive quantities; the other two are calculated. AC reactive loads need phase and impedance information.