Red Seal Electrician Practice
Power factor and three-phaseQuestion 1032 of 1506

In a balanced Y-connected system, how is the line voltage related to the phase voltage?

  1. Line voltage equals phase voltage
  2. Line voltage is phase voltage × √3
  3. Line voltage is phase voltage ÷ √3
  4. Line voltage is twice the phase voltage
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Correct answer: Line voltage is phase voltage × √3

In Y connections the line voltage is larger than the phase voltage by √3 (about 1.732).

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.5: Three-phase Y and Delta Configurations

Practice power factor and three-phase

Questions last reviewed: 18 October 2026