Red Seal Electrician Practice
Electrical mathQuestion 771 of 1506

A battery is rated at 60 Ah. Ideally, how long can it supply a steady 4 A?

  1. 240 h
  2. 56 h
  3. 0.07 h
  4. 15 h
Show answer

Correct answer: 15 h

Time = capacity / current = 60 Ah / 4 A = 15 h.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.3: Battery Ratings

Practice electrical math

Questions last reviewed: 18 October 2026