Red Seal Electrician Practice
Electrical mathQuestion 1256 of 1506

A motor has a full load current of 12 A. Its locked rotor current is 600% of full load current. What current does it draw at start?

  1. 72 A
  2. 12 A
  3. 60 A
  4. 7.2 A
Show answer

Correct answer: 72 A

600% is 6 times: 12 A x 6 = 72 A.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.7: Tesla Polyphase Induction Motors

Practice electrical math

Questions last reviewed: 18 October 2026