Three Identical Lightbulbs Are Connected in Parallel to a Constant

question 37

Multiple Choice

Three identical lightbulbs are connected in parallel to a constant voltage power supply. Initially, switch S₁ is closed and the other two switches open. When the other two switches, S₂ and S₃, are closed, the brightness of the first light bulb B₁

• A) will be less.
• B) will be unchanged.
• C) will be more.
• D) will depend on how long the switches are on.
• E) cannot be predicted without knowledge of V and resistance.

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