12.07.2015 Views

Chapter 13 - Electric Circuits

Chapter 13 - Electric Circuits

Chapter 13 - Electric Circuits

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Announcements <strong>Electric</strong>al Resistance Magnetic Fields Final QuestionsQuestion #1A circuit is constructed using a 9-V battery and two resistors with resistances of 3-Ω and 6-Ω are placed, in series.What is the current in the circuit?AnswerFor two resistors placed in series, the equivalent resistance is R = R 1 + R 2 = 9 ΩTherefore, the current in the circuit isI = ∆VR = 9 V9 Ω = 1 AQuestion #2A voltage drop ∆V is connected across a resistor with a resistance R, causing a current I through the resistor.Rank the following variations according to the change in the rate at which electrical energy is converted to thermalenergy in the resistor, greatest first: (a) ∆V is doubled with R unchanged, (b) I is doubled with R unchanged, (c)R is doubled with ∆V unchanged, (d) R is doubled with I unchanged.Answer(a) = (b), (d), (c)<strong>Electric</strong> <strong>Circuits</strong>

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