Red Seal Electrician Practice
DC circuitsQuestion 1330 of 1506

A current of 12 A flows in a 5 Ω heating element. How much power does the element dissipate?

  1. 300 W
  2. 60.0 W
  3. 720 W
  4. 360 W
Show answer

Correct answer: 720 W

P = I² × R = (12 A)² × 5 Ω = 720 W.

Source: Computed, 2.4: Calculating Electric Power

Practice dc circuits

Questions last reviewed: 18 October 2026