If the primary of a transformer were 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 these

Question

Quizplus · Accepted Answer

A transformer requires a changing magnetic field to induce voltage in the secondary coil, which is provided by an alternating current (AC). A direct current (DC) does not change over time, so it will not induce a continuous voltage in the secondary. However, a transient voltage may be induced when the DC is initially connected or disconnected due to the sudden change in current.

If the Primary of a Transformer Were Connected to a Dc