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SAT® Subject Test in Physics

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Bulb Brightness in Two Circuits

SATPHY-E1KZQ5

The two circuits pictured below show the same two lightbulbs, numbered 1 and 2. The lightbulbs are made of the same materials, but bulb 1 has a significantly higher resistance than bulb 2.

In the top circuit, we see the bulbs wired in series with each other; in the bottom, we see the bulbs wired in parallel with each other.

The bulbs are connected to the same battery in both circuits.

Which table correctly represents the brightness of bulb 1 compared to bulb 2 in the series and in the parallel circuits?

A
Lightbulb 1
Series brighter
Parallel brighter
B
Lightbulb 1
Series brighter
Parallel dimmer
C
Lightbulb 1
Series dimmer
Parallel brighter
D
Lightbulb 1
Series dimmer
Parallel dimmer
E
Lightbulb 1
Series brighter
Parallel same