A transformer is a device used to
A)transform an alternating current into a direct current.
B)transform a direct current into an alternating current.
C)increase or decrease an ac voltage.
D)increase or decrease a dc voltage.

Question

Quizplus · Accepted Answer

A transformer is specifically designed to increase or decrease the voltage of an alternating current (ac) without changing the frequency. It does not work with direct current (dc) as the current must be changing in order for the magnetic field to induce a voltage in the other coil. Therefore, choices A and D are incorrect. Choice B is also incorrect as a transformer cannot produce an alternating current from a direct current.

A Transformer Is a Device Used to