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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 156 of 200

Q156
General SciencePhysics
Alternating current is transmitted to distant places at
  1. a.high voltage and low current.
  2. b.high voltage and high current.
  3. c.low voltage and low current.
  4. d.low voltage and high current.

Answer: (A) high voltage and low current.

Power loss in transmission lines is $I^2R$, so power is sent at very high voltage, which makes the current low for the same power and cuts the heating loss. Step-up transformers raise the voltage at the station and step-down transformers lower it near consumers.

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Alternating current is transmitted to distant places at — WBCS Main Examination 2023 Q156 | Prostuti360°