Test3Fall23KEY_0

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University of Washington *

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Electrical Engineering

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Dec 6, 2023

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docx

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12) For the circuit shown in the figure, determine the current in (a) the 7 Ω resistor. (b) the 8 Ω resistor. (c) the 4 Ω resistor. Answer: (a) 1.6 A (b) 1.3 A (c) 0.28 A Var: 1 13) Consider the circuit shown in the figure. Note that two currents are shown. Calculate the emfs ε 1 and ε 3 . Answer: ε 1 = 28 V, ε 3 = 44 V Var: 1 14) The power rating of a 400 Ω resistor is 0.8 W. (a) What is the maximum voltage that can be applied across this resistor without damaging it? (b) What is the maximum current this resistor can draw without damaging it? Answer: (a) 17.9 V (b) 44.7 mA Var: 1 15) A light bulb is connected to a 110-V source. What is the resistance of this bulb if it is a 100-W bulb? A) 100 Ω B) 8.0 mΩ C) 6.0 mΩ D) 120 Ω E) 240 Ω Answer: D Var: 1
Figure for problems 16 (a) and 16 (b). Capacitor is on the left, switch and voltage source on top, resistor on the right. 16) A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the instant the switch is closed, completing the circuit, (a) the voltage across the capacitor is A) greater than the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A) greater than the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. Answer: (a) D (b) C Var: 1 17) RC circuits: A 4 mF capacitor is discharged through a 4 kΩ resistor. How long will it take for the capacitor to lose 50% of its initial stored charge? A) 16 s B) 8 s C) 11.1 s D) 11.1 ms E) 16 ms Answer: C, time constant tau=16 sec Var: 5 Topic: RC circuits
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