Red Seal Electrician Practice
DC circuitsQuestion 575 of 1506

A resistor has 10 V across it and 2 A through it. What minimum power rating should it have?

  1. 5 W
  2. 12 W
  3. 0.2 W
  4. 20 W
Show answer

Correct answer: 20 W

P = 10 V x 2 A = 20 W.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 2.5: Resistors

Practice dc circuits

Questions last reviewed: 18 October 2026