Ohm's Law Calculator
Easily calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to get the other two instantly.
Ohm's Law Formulas
- V = I × R
- I = V ÷ R
- R = V ÷ I
- P = V × I
- P = I² × R
- P = V² ÷ R
Example Calculations
- V = 20V, R = 10Ω → I = 20 ÷ 10 = 2A
- V = 20V, I = 2A → P = 20 × 2 = 40W
- I = 2A, R = 10Ω → V = 2 × 10 = 20V
Ohm's Law Table
| V (V) | I (A) | R (Ω) | P (W) |
|---|
| 20 | 2 | 10 | 40 |
| 12 | 1 | 12 | 12 |
| 9 | 3 | 3 | 27 |
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