Ohm's Law relates voltage (V), current (I), and resistance (R) in electrical circuits: V = I * R. It is foundational for electronics, physics, and electrical engineering.
The Three Forms
Solve for any variable: V = IR, I = V/R, R = V/I. Try the Ohm's Law Calculator.
Example
12V battery, 4 ohm resistor: I = 12/4 = 3A current flows through the circuit.
Related: Electrical Power
Power P = VI = I^2 * R = V^2/R, measured in watts. Higher voltage or current means more power dissipated.
Going Deeper
Understand voltage, current, and resistance in electrical circuits. This guide connects theory to practice — use the related calculators linked at the bottom to verify each example with your own numbers.
Practical Tips
- Write down given values and unknowns before opening the calculator.
- Check units and rounding rules appropriate to your context (class, lab, or business).
- Compare manual working with the calculator result to build confidence.
Common Mistakes to Avoid
- Rushing inputs without reading field labels carefully.
- Confusing similar formulas that use different variables or units.
- Reporting results with more precision than your inputs justify.
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