Red Seal Electrician Practice
DC circuitsQuestion 767 of 1506

A battery has an EMF of 12 V and an internal resistance of 0.05 Ω. What is the most current it can supply into a short circuit?

  1. Infinite
  2. 240 A
  3. 0.6 A
  4. 24 A
Show answer

Correct answer: 240 A

Only the internal resistance limits the current: 12 V / 0.05 Ω = 240 A.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.2: Battery Construction

Practice dc circuits

Questions last reviewed: 18 October 2026