alleryStart learning →What reasons are given for AC winning out over DC for distribution?
ACheaper generators and safer wiring
BTransformers and lower line losses
CLower shock risk at equal voltage
DSimpler switching at high current
Answer & Solution
Correct answer: B. Transformers and lower line losses
1. Transformers make it practical to step an AC voltage up and back down again.
2. High transmission voltage means small current, and small current means small I squared R loss.
3. Those two advantages together are why AC prevailed.
4. Lower shock risk is not among them, since AC shocks are in fact often more harmful than DC ones.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Why Use AC for Power Distribution?_
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