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anonymous

  • 5 years ago

Someone who really understands electricity concepts - help me out! I describe the problem in detail on my site http://www.romakoulikov.com/another-ohms-law-question-that-stumped-me/

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  1. anonymous
    • 5 years ago
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    The question focuses on the energy consumed by the lamp, not the entire system. Use the following formulas: \[V = IR\]\[P = I^2R\]\[E = Pt = I^2Rt\] First Situation: Timer has no resistance. Lamp has resistance R. Total Voltage: V Total Resistance: R Total Current: I Resistance of Lamp: R Current through Lamp: I Energy Consumed: E Second Situation: Timer has resistance R. Lamp has resistance R. Total Voltage: V Total Resistance: 2R Total Current: V/2R = I/2 Resistance of Lamp: R Current through Lamp: I/2 Energy Consumed: E/4 Therefore, the energy consumed in the second situation is 1/4 the energy consumed in the first answer. The correct choice is C - it will be 1/4 as great.

  2. anonymous
    • 5 years ago
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    Thank you very much physmath96. Got it!

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