Electrical fundamentalsMVP
Ohm's law
Solve for voltage, current, or resistance in a resistive (ohmic) circuit.
Inputs
Result
Enter values and calculate to see the result.
Interpretation
Pick what to solve for, enter the other two values, and calculate. Results use SI internally, so any unit you choose is converted automatically.
Formula
V = I · R
Voltage equals current times resistance.
Variables
| Symbol | Variable | Unit |
|---|---|---|
| V | Voltage | V |
| I | Current | A |
| R | Resistance | Ω |
Assumptions & validity
This tool assumes:
- Ohmic (linear) device: resistance is constant.
- DC / steady-state conditions.
Worked example
A 500 Ω resistor carries 10 mA. What is the voltage across it?
V = 0.010 A × 500 Ω = 5 V