AP® Physics 1 & 2

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Moderate

Transformer and Battery

APPH12-KTE9KF

A large electromagnetic transformer that is used for classroom demonstrations involves two coils of wire wrapped around opposite sides of a solid iron core. When the primary coil, with terminals A and B, is connected to a 9-volt AC power source, the light bulb in the secondary other coil seems to glow with constant brightness.

If terminals A and B were instead connected to a 9-volt battery, then the light bulb would

A

glow with much brighter and constant intensity.

B

at first glow bright, but then slowly fade until it was not glowing at all.

C

flash bright at the instant the terminals are connected, but then not glow at all.

D

never glow.