Multiple choice

What is the device that steps up or steps down the voltage?

  1. Dynamo

  2. Conductor

  3. Inductor

  4. Transformer

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A transformer changes AC voltage levels through electromagnetic induction between primary and secondary coils. It cannot work with DC current. Dynamos generate electricity, conductors transmit current, and inductors oppose current changes.