Red Seal Electrician Practice
Power factor and three-phaseQuestion 1011 of 1506

A series-connected pair of loads on a 240 V supply has no neutral. One load opens. What happens to the other load?

  1. It receives double voltage
  2. It keeps working normally
  3. Its current stops too
  4. It receives 120 V from the earth
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Correct answer: Its current stops too

In a series circuit one open stops current in the whole loop. The neutral wire is added to prevent this.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.1: Single-Phase Power Systems

Practice power factor and three-phase

Questions last reviewed: 18 October 2026