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Problem 3: Consider the following circuit. Assume that each of the three light bulbs has the same resistance. switch a) Before the switch is thrown, rank the brightness of bulbs A, B, and C. Explain your reasoning. b) After the switch is thrown, rank the brightness of bulbs A, B, and C. Explain your reasoning.
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Answer #1

Solution,

when the switch is open :

current throgh A will be V/R and current throght B and C will be V / (2R)

hence iA is 2 times iB and iC and iB = iC

so ranking is: A then (B and C)

B) when the switch is closed :

C will be shorted and iC is nearly zero

so iA nearly equals iB

so ranking is : A , B , C

Comment in case any doubt please rate my answer....

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