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An advantage of a.c. over d.c. for power transmission is that
AA.c. heats wires less than d.c. of the same value
BA.c. always travels faster than d.c. through wires
CA.c. voltage can be stepped up or down with transformers
DA.c. cannot give an electric shock to a person
Answer & Solution
Correct answer: C. A.c. voltage can be stepped up or down with transformers
1. The chapter lists transformer use as a key advantage of a.c.
2. Transformers raise the voltage for low-loss long-distance transmission.
3. At the user end they drop voltage to a safe level.
4. D.c. cannot be transformed easily, so a.c. wins for transmission.
_Source: Selina Concise Physics Class 10, Ch 10 Electromagnetism (Mistral OCR'd PDF), section on a.c. advantages_
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