A step-down transformer transfers power from the 120 Volt alternating current passing through its primary coil to the 12 volt alternating current passing through its secondary coil. If you interchange the primary and secondary coil, and send the 120 Volt alternating current through the new primary coil,
A) a 12 Volt alternating current will pass through its new secondary coil.
B) a 12 Volt direct current will pass through its new secondary coil.
C) no current will pass through its new secondary coil.
D) a 1200 Volt alternating current will pass through its new secondary coil.

Question

Quizplus · Accepted Answer

When you interchange the primary and secondary coils of a step-down transformer (originally designed to reduce voltage from 120V to 12V) and then apply 120V to the new primary (originally the secondary), the transformer acts as a step-up transformer, increasing the voltage by the same ratio. Since the original transformation ratio was 120V to 12V (a factor of 10), applying 120V to the new primary will step up the voltage by a factor of 10, resulting in 1200V on the new secondary.

A Step-Down Transformer Transfers Power from the 120 Volt Alternating