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Two light bulbs shown in the circuit have rating `A(24 V, 24W) and B(24 V and 36W)` as shown. When the switch is closed, A. the intensity of light bulb A increases.B. the intensity of light bulb A decreasesC. the intensity of light bulb B increasesD. the intensity of light bulb B decreases |
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Answer» Correct Answer - B::C b., c. For a bulb `R = V^2/W` or `R_(B)leR_(A)` when switch is open `I_A = I_(B)` `P_(A) = R_(A)I_(A)^(2)` `P_A = R_(A)I_(A)^(2)` `P_(B)ltP_(A)` and `V_(A)gtV_(B)` `V_(A)gt12V` and `V_(B) lt 12V` After closing the switch `V = V_(B) = 12 V` or `P_(B) = 36W` `P_(A) = 24W` . |
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