Red Seal Electrician Practice
DC circuitsQuestion 573 of 1506

A 10 ohm resistor carries 3 A. What power does it dissipate?

  1. 30 W
  2. 300 W
  3. 33 W
  4. 90 W
Show answer

Correct answer: 90 W

P = I squared x R = 9 x 10 = 90 W.

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

Practice dc circuits

Questions last reviewed: 18 October 2026