If the primary of a transformer is connected to a dc power source, the transformer would have a voltage output
A)at a higher efficiency than with an ac source.
B)the same.
C)that is also dc.
D)only while being connected or disconnected.
E)none of the above

Question

Quizplus · Accepted Answer

Transformers require a changing magnetic field to induce a voltage in the secondary coil. DC does not change once established, so a transformer will only induce a voltage during the transient moments of connection or disconnection when the current is changing.

If the Primary of a Transformer Is Connected to a Dc