Power factor and three-phaseQuestion 1005 of 1506

What is a split-phase power system?

  1. Two sources 90 degrees apart in series with no neutral
  2. Three sources 120 degrees apart with a neutral
  3. Two in-phase sources in series with a centre neutral
  4. One single source with a grounded centre and no neutral
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Correct answer: Two in-phase sources in series with a centre neutral

It gives two load voltages and a higher voltage between the hot wires, using three wires.

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