Home › ICSE Class 10 › physics › Electromagnetism › An advantage of a.c. over d.c. for power transmi…
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_
Related questions
In an a.c. generator, the slip-rings serve toInduction is greater in a coil whenIn a transformer the primary and secondary coils are usually wound aroundThe d.c. motor uses which rule to predict the direction of rotation?In Fleming's left-hand rule the thumb representsThe strength of an electromagnet can be increased byAn electromagnet differs from a permanent magnet because itA step-down transformer with 1000 primary turns and 100 secondary turns connected to 220 V