Red Seal Electrician Practice
TransformersQuestion 904 of 1506

Why is long-distance power transmitted at a high voltage?

  1. A higher voltage makes the wire resistance fall to zero.
  2. DC cannot be sent at low voltage at all.
  3. Less current carries the same power, so losses drop.
  4. High voltage raises the frequency of the supply.
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Correct answer: Less current carries the same power, so losses drop.

A transformer steps voltage up and current down for the line. Less current means less power lost in the wire resistance.

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

Practice transformers

Questions last reviewed: 18 October 2026