PhysicsLAB: Test Scenario: Bulb Brightness

This scenario is based on an AP Physics B essay: 2002 Form B FRQ #3.

Refer to the following information for the next two questions.

Light bulbs of fixed resistance 3.0 Ω and 6.0 Ω, are connected in the schematic diagram shown above. Switch S is initially closed.

(a) Calculate the current in Bulb A.

(b) Which light bulb is the brightest? Justify your answer.

Refer to the following information for the next six questions.

The switch is now opened.

(c) i. Check the appropriate choice to indicate whether the brightness of Bulb A increases, decreases, or remains the same.

increasesdecreasesremains the same

Explain your choice.

(c) ii. Check the appropriate choice to indicate whether the brightness of Bulb B increases, decreases, or remains the same.

increasesdecreasesremains the same

Explain your choice.

(c) iii. Check the appropriate choice to indicate whether the brightness of Bulb C increases, decreases, or remains the same.

increasesdecreasesremains the same

Explain your choice.