Red Seal Electrician Practice
AC generationQuestion 902 of 1506

An alternator shaft is turned faster. What is the effect on its output?

  1. Polarity reverses more often each second.
  2. The output changes over to DC.
  3. The output frequency falls.
  4. The voltage polarity stops changing.
Show answer

Correct answer: Polarity reverses more often each second.

A faster-spinning magnet passes the coils more often, so the polarity reverses more often.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 1.1: What is Alternating Current (AC)?

Practice ac generation

Questions last reviewed: 18 October 2026