What formula should I use to find power from voltage, current, and resistance?

When you have all three values, you can use any formula but verify your data first:

Primary formulas:

1. P = V × I
2. P = I² × R
3. P = V² / R

Verification check: Use Ohm's Law (V = I × R) to ensure your values are consistent.

Best practice:

• Calculate using two different formulas
• Compare results they should match
• If they don't match, recheck your measurements

Example: Given: V = 12V, I = 2A, R = 6Ω

• Check: V = I × R → 12 = 2 × 6 ✓ (Values are consistent)
• P = V × I = 12 × 2 = 24W
• P = I² × R = 4 × 6 = 24W ✓
• P = V² / R = 144 / 6 = 24W ✓