Red Seal Electrician Practice
DC circuitsQuestion 559 of 1506

A current of 3 A flows through a 40 ohm resistor. What is the voltage across it?

  1. 13.3 V
  2. 43 V
  3. 37 V
  4. 120 V
Show answer

Correct answer: 120 V

E = I x R = 3 A x 40 ohms = 120 V.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 2.1: Ohm’s Law - How Voltage, Current, and Resistance Relate

Practice dc circuits

Questions last reviewed: 18 October 2026