Transformer and DC Operation – Rankers Physics
Topic: Alternating Current
Subtopic: Average Current and RMS Current

Transformer and DC Operation

Assertion (A): Transformer does not work on \( \text{dc} \).
Reason (R): \( \text{dc} \) neither changes in magnitude nor in direction.
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

Transformers operate on the principle of mutual induction, requiring a changing magnetic flux. \( text{dc} \) current produces a constant magnetic field, thus no change in flux and no induced EMF. Hence, (A) is true. \( text{dc} \) current indeed has constant magnitude and direction, so (R) is also true and correctly explains (A).

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