Ohm’s law calculator
Find current and power from DC voltage and resistance.
Formula
I = V/R; P = V²/R
Current (A) ≈ (12)÷(6) · Power (W) ≈ (12)^2÷(6)
How to use
- Enter voltage in volts.
- Enter positive resistance in ohms.
- Read amperes and watts.
Examples
- 9 V across 3 Ω gives 3 A.
Frequently asked questions
How many amps flow through 6 Ω at 12 V?
2 A. The resistor dissipates 24 W.
Does this apply to every component?
It models an ohmic resistance at fixed conditions.
Can resistance be zero?
No. Division by zero is undefined in this model.
Sources
Updated: