Electric Circuits - Switch Effect on Light Bulbs · PhysicsBowl 2015 #10
Physics · electromagnetism
Problem
For the circuit shown, the three light bulbs have identical resistance R, the battery is ideal, and all wires have no resistance. Which one of the following choices correctly identifies the light bulbs that either become dimmer or go out completely when the switch, S, in the circuit is closed?
[Figure: Circuit diagram with three light bulbs and a switch]
(A) All 3 bulbs
(B) Bulbs #1 and #2 only
(C) Bulb #3 only
(D) Bulb #1 only
(E) None of the bulbs