Power Dissipation Calculator

Find power dissipated in a resistor.

Power dissipated (W) 40

Formula: P = I² × R

Step-by-step with your numbers:

1. Values used:

2. Current = 2 A

3. Resistance = 10 Ω

5. Power dissipated = 40W

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Resistors turn electrical energy into heat at this rate.

The math behind it

P = current² × resistance (also P = V²/R or V×I).

2 A through 10 Ω → 40 W.

Resistor rating?

Pick a resistor rated above this power to avoid overheating.