University Physics (14th Edition)
University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 31, Problem 31.35E

A Step-Down Transformer. A transformer connected to a 120 V (rms) ac line is to supply 12.0 V (rms) to a portable electronic device. The load resistance in the secondary is 5.00 Ω. (a) What should the ratio of primary to secondary turns of the transformer be? (b) What rms current must the secondary supply? (c) What average power is delivered to the load? (d) What resistance connected directly across the 120-V line would draw the same power as the transformer? Show that this is equal to 5.00 Ω times the square of the ratio of primary to secondary turns.

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A Step-Down Transformer. A transformer connected to a 120-V (rms) ac line is to supply 12.0 V (rms) to a portable electronic device. The load resistance in the secondary is 5.00 Ω (a) What should the ratio of primary to secondary turns of the transformer be? (b) What rms current must the secondary supply? (c) What average power is delivered to the load? (d) What resistance connected directly across the 120-V line would draw the same power as the transformer?
A transformer on a utility pole steps the rms voltage down from 12 kV to 240 V. (a) What is the ratio of the number of secondary turns to the number of primary turns? (b) If the input current to the transformer is 2.0 A, what is the output current? (c) Determine the power loss in the transmission line if the total resistance of the transmission line is 200 Ω . (d) What would the power loss have been if the transmission line was at 240 V the entire length of the line, rather than providing voltage at 12 kV? What does this say about transmission lines?
A neon sign transformer has a 360W AC output with an rms voltage of 17 kV when connected to a normal household outlet. There are 500 turns of wire in the primary coil. A)How many turns of wire does the secondary coil have? B)When the transformer is running at full power, what is the current in the secondary coil? C)The current in the primary coil?

Chapter 31 Solutions

University Physics (14th Edition)

Ch. 31 - Prob. Q31.11DQCh. 31 - A light bulb and a parallel-plate capacitor with...Ch. 31 - A coil of wire wrapped on a hollow tube and a...Ch. 31 - A circuit consists of a light bulb, a capacitor,...Ch. 31 - A circuit consists of a light bulb, a capacitor,...Ch. 31 - Prob. Q31.16DQCh. 31 - An ideal transformer has N1, windings in the...Ch. 31 - An inductor, a capacitor, and a resistor are all...Ch. 31 - You want to double the resonance angular frequency...Ch. 31 - Prob. 31.1ECh. 31 - A sinusoidal current i = I cos t has an rms value...Ch. 31 - The voltage across the terminals of an ac power...Ch. 31 - A capacitor is connected across an ac source that...Ch. 31 - An inductor with L = 9.50 mH is connected across...Ch. 31 - A capacitance C and an inductance L are operated...Ch. 31 - Kitchen Capacitance. The wiring for a refrigerator...Ch. 31 - (a) Compute the reactance of a 0.450-H inductor at...Ch. 31 - (a) What is the reactance of a 3.00-H inductor at...Ch. 31 - A Radio Inductor. You want the current amplitude...Ch. 31 - A 0.180-H inductor is connected in series with a...Ch. 31 - A 250- resistor is connected in series with a...Ch. 31 - A 150- resistor is connected in series with a...Ch. 31 - You have a 200- resistor, a 0.400-H inductor, and...Ch. 31 - The resistor, inductor, capacitor, and voltage...Ch. 31 - Prob. 31.16ECh. 31 - In an L-R-C series circuit, the rms voltage across...Ch. 31 - A resistor with R = 300 and an inductor are...Ch. 31 - The power of a certain CD player operating at 120...Ch. 31 - In an L-R-C series circuit, the components have...Ch. 31 - (a) Show that for an L-R-C series circuit the...Ch. 31 - (a) Use the results of part (a) of Exercise 31.21...Ch. 31 - An L-R-C series circuit with L = 0.120 H, R = 240...Ch. 31 - An L-R-C series circuit is connected to a 120-Hz...Ch. 31 - A series ac circuit contains a 250- resistor, a...Ch. 31 - In an L-R-C series circuit the source is operated...Ch. 31 - Analyzing an L-R-C Circuit. You have a 200-...Ch. 31 - An L-R-C series circuit is constructed using a...Ch. 31 - In an L-R-C series circuit, R = 300, L = 0.400 H,...Ch. 31 - An L-R-C series circuit consists of a source with...Ch. 31 - In an L-R-C series circuit, R = 150 , L = 0.750 H,...Ch. 31 - In an L-R-C series circuit, R = 400 , L = 0.350 H,...Ch. 31 - In an L-R-C series circuit, L = 0.280 H and C =...Ch. 31 - Section 31.6 Transformers 31.34Off to Europe! You...Ch. 31 - A Step-Down Transformer. A transformer connected...Ch. 31 - A Step-Up Transformer. A transformer connected to...Ch. 31 - A coil has a resistance of 48.0 . At a frequency...Ch. 31 - Prob. 31.38PCh. 31 - An L-R-C series circuit has C = 4.80 F, L = 0.520...Ch. 31 - Five infinite-impedance voltmeters, calibrated to...Ch. 31 - CP A parallel-plate capacitor having square plates...Ch. 31 - Prob. 31.42PCh. 31 - A series circuit has an impedance of 60.0 and a...Ch. 31 - A large electromagnetic coil is connected to a...Ch. 31 - In an L-R-C series circuit, R = 300 , XC = 300 ,...Ch. 31 - At a frequency 1, the reactance of a certain...Ch. 31 - A High-Pass Filter. One application of L-R-C...Ch. 31 - A Low-Pass Filter. Figure P31.48 shows a low-pass...Ch. 31 - An L-R-C series circuit is connected to an ac...Ch. 31 - An L-R-C series circuit is connected to an ac...Ch. 31 - In an L-R-C series circuit the magnitude of the...Ch. 31 - In an L-R-C series circuit, the phase angle is...Ch. 31 - An L-R-C series circuit has R = 500 . L = 2.00 H,...Ch. 31 - The L-R-C Parallel Circuit. A resistor, an...Ch. 31 - The impedance of an L-R-C parallel circuit was...Ch. 31 - A 400- resistor and a 6.00-F capacitor are...Ch. 31 - An L-R-C series circuit consists of a 2.50-F...Ch. 31 - An L-R-C series circuit has R = 60.0 , L = 0.800...Ch. 31 - In an L-R-C series circuit, the source has a...Ch. 31 - In an L-R-C series ac circuit, the source has a...Ch. 31 - A resistance R, capacitance C, and inductance L...Ch. 31 - The Resonance Width. Consider an L-R-C series...Ch. 31 - An L-R-C series circuit draws 220 W from a 120-V...Ch. 31 - DATA A coworker of yours was making measurements...Ch. 31 - DATA You are analyzing an ac circuit that contains...Ch. 31 - DATA You are given this table of data recorded for...Ch. 31 - CALC In an L-R-C series circuit the current is...Ch. 31 - CALC (a) At what angular frequency is the voltage...Ch. 31 - Prob. 31.69PPCh. 31 - If the electrode oscillates between two points 20...Ch. 31 - The signal from the oscillating electrode is fed...Ch. 31 - If the frequency at which the electrode is...
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