A transformer provides the 12,000 volts needed to operate the neon sign in a local convenience store. When AC current flows through the transformer's primary coil and experiences a voltage drop of 120 volts, current flows through the transformer's secondary coil and experiences a voltage rise of 12,000 volts. Based on this observation, it is likely that
A) the currents in the two coils are about equal.
B) the secondary coil has about 100 times as many turns in it as the primary coil.
C) the current in the secondary coil is about 100 times as large as the current in the primary coil.
D) the primary coil has about 100 times as many turns in it as the secondary coil.

Question

Quizplus · Accepted Answer

The voltage increase from 120 volts to 12,000 volts indicates that the secondary coil must have a greater number of turns than the primary coil. The ratio of the voltages (12,000/120 = 100) suggests that the secondary coil has about 100 times as many turns as the primary coil.

A Transformer Provides the 12,000 Volts Needed to Operate the Neon