Chapt_27

# Chapt_27 - University Physics(Prof David Flory Chapt_27 Sunday Page 1 Name Date 1 By using only two resistors R1 and R2 a student is able to obtain

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University Physics (Prof. David Flory) Chapt_27 Sunday, February 03, 2008 Page 1 Name: __________________________ Date: _____________ 1. By using only two resistors, R 1 and R 2 , a student is able to obtain resistances of 3 Ω , 4 Ω , 12 Ω , and 16 Ω . The values of R 1 and R 2 (in ohms) are: A) 3, 4 B) 2, 12 C) 3, 16 D) 4, 12 E) 4, 16 2. Four 20- Ω resistors are connected in parallel and the combination is connected to a 20- V emf device. The current in any one of the resistors is: A) 0.25 A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 A 3. In the figure, voltmeter V 1 reads 600 V, voltmeter V 2 reads 580 V, and ammeter A reads 100 A. The power wasted in the transmission line connecting the power house to the consumer is: A) 1 kW B) 2 kW C) 58 kW D) 59 kW E) 60 kW Write the letter for the correct answer on the answer sheet. Write clearly.

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University Physics (Prof. David Flory) Chapt_27 Sunday, February 03, 2008 Page 2 4. A series circuit consists of a battery with internal resistance r and an external resistor R . If these two resistances are equal ( r = R ) then the thermal energy generated per unit time by the internal resistance r is: A) the same as by R B) half that by R C) twice that by R D) one-third that by R E) unknown unless the emf is given 5. A certain ammeter has an internal resistance of 1 Ω and a range from 0 to 50 mA. To make its range from 0 to 5 A, use: A) a series resistance of 99 Ω B) an extremely large (say 10 6 Ω ) series resistance C) a resistance of 99 Ω in parallel D) a resistance of 1/99 Ω in parallel E) a resistance of 1/1000 Ω in parallel 6. A 120-V power line is protected by a 15-A fuse. What is the maximum number of “120 V, 500 W” light bulbs that can be operated at full brightness from this line? A) 1 B) 2 C) 3 D) 4 E) 5 7. Two identical batteries, each with an emf of 18 V and an internal resistance of 1 Ω , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4-
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## This note was uploaded on 11/20/2011 for the course PHYSICS 2 taught by Professor Davidflory during the Spring '11 term at WPUNJ.

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Chapt_27 - University Physics(Prof David Flory Chapt_27 Sunday Page 1 Name Date 1 By using only two resistors R1 and R2 a student is able to obtain

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