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SAT® Subject Test in Physics

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Moderate

Parallel Bulbs Closing Switch

SATPHY-XCXKXV

The circuit below shows two lightbulbs numbered 1 and 2 wired in a circuit. Assume the battery has negligible internal resistance.

Which table best describes the lightbulbs before and after the switch is closed (off, on, brighter than before, dimmer than before)?

A
Bulb Switch Closed After Switch Closed
Bulb 1 on brighter than before
Bulb 2 on dimmer than before
B
Bulb Switch Closed After Switch Closed
Bulb 1 off on
Bulb 2 on dimmer than before
C
Bulb Switch Closed After Switch Closed
Bulb 1 off on
Bulb 2 on same as before
D
Bulb Switch Closed After Switch Closed
Bulb 1 off on
Bulb 2 on brighter than before
E
Bulb Switch Closed After Switch Closed
Bulb 1 off on
Bulb 2 off on