Which statement is a recognized characteristic of single-phase power?

Question

Options

• ASingle-phase power excludes the use of three-phase power in the data center.
• BSingle-phase power provides an effective means for delivering DC power to the data center.
• CSingle-phase power is an effective choice of power supply when data center loads require large volumes of power.
• DSingle-phase power implies that power comes into the data center with one "hot" wire, along with accompanying neutral and ground.

• A
  3% (1)
• B
  11% (4)
• C
  6% (2)
• D
  81% (29)

Explanation

Option D is correct because it accurately defines the fundamental characteristic of single-phase power: one "hot" (live) conductor carries alternating current to the load, accompanied by a neutral wire to complete the circuit and a ground wire for safety. This is the standard configuration for single-phase AC delivery, distinguishing it from three-phase systems that use three hot conductors.

Option A is wrong because single-phase and three-phase power are not mutually exclusive -- data centers routinely use both simultaneously, routing three-phase power to high-density equipment while single-phase serves lighter loads. Option B is wrong because single-phase delivers AC (alternating current), not DC; converting to DC happens downstream within equipment power supplies. Option C is wrong because single-phase is actually a poor choice for large power loads -- three-phase power is far more efficient and capable at scale, which is why it dominates high-power data center infrastructure.

Memory tip: The word "single" tells you everything -- one hot wire, one phase of alternating current, versus three-phase which has three hot wires. If you remember "single = one hot wire + neutral + ground," you can eliminate every distractor.

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