DC circuitsQuestion 572 of 1506

A heating element of 6 ohms is connected to 24 V. What power does it use?

  1. 4 W
  2. 144 W
  3. 24 W
  4. 96 W
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Correct answer: 96 W

P = E squared / R = 576 / 6 = 96 W.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 2.4: Calculating Electric Power

Practice dc circuits

Questions last reviewed: 18 October 2026