Single-Phase vs
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Questions and Answers

What is the main difference between single-phase and 3-phase power?

  • Single-phase power has a phase wire and a ground wire
  • Single-phase power has current flowing between one power wire and one neutral wire
  • 3-phase power requires more conductor material
  • 3-phase power has three separate voltages present (correct)

    • How are the phase AC signals in a 3-phase power circuit spaced?

  • 120 electrical degrees apart (correct)
  • 60 electrical degrees apart
  • 180 electrical degrees apart
  • 90 electrical degrees apart

    • Why is less conductor material required in 3-phase power compared to single-phase power?

  • 3-phase power is 1.73 times more than single-phase voltage (correct)
  • 3-phase power uses thicker wires
  • 3-phase power has a lower power factor
  • 3-phase power has a higher risk of voltage drop

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