Question

Transformer is based upon the principle of:

• A. self- induction
• B. mutual induction
• C. eddy current
• D. none of these

Answer 1

Answer: (B)

mutual induction

Answer 2

Transformer consists of two coils one primary and the other secondary. Transformer is a device based on the principle of mutual induction, which is used for converting large alternating current at low voltage into small current at high voltage and vice-versa. The transformer which converts low voltages into higher ones are called step-up transformers, while those which convert high voltages into lower ones are called step-down transformers. $2$ Transformers are used only in $AC$ not $DC$.