University Physics Volume 2
University Physics Volume 2
18th Edition
ISBN: 9781938168161
Author: OpenStax
Publisher: OpenStax
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Chapter 15, Problem 61CP

The 335-kV ac electricity from a power transmission line is fed into the primary winding of a transformer. The ratio of the number of turns in the secondary winding to the number in the primary winding is N s / N p = 100 . (a) What voltage is induced in the secondary winding? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

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The 3.2-MV AC electricity from a power transmission line is fed into the primary coil of a transformer. The ratio of the number of turns in the secondary coil to the number in the primary is Ns/Np = 95.    Part (a)  What is the voltage, in megavolts, of the output from the secondary coil of the transformer?  Vs = 304       Part (b)  The result from part (a) is much too high, well above the breakdown voltage of air over reasonable distances (which is about a megavolt per meter). Which assumption is unreasonable and responsible for this engineering error?  a. The input voltage is unreasonably low. b. The input voltage is unreasonably high. c. The ratio of the number of turns is unreasonably high. d. The ratio of turns in unreasonably low. e. None of the assumptions are unreasonable. f. An assumption not listed here.
The 335-kV ac electricity from a power transmission line is fed into the primary winding of a transformer. The ratio of the number of turns in the secondary winding to the number in the primary winding is Ns /Np = 1000 .(a) What voltage is induced in the secondary winding? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?
A transmission line that has a resistance per unit length of 4.00 x 10-4 n /m is to be used to transmit 5.00 MW over 400 miles (6.44 × 105 m). The output voltage of the generator is 4.50 kV. (a) What is the line loss if a transformer is used to step up the voltage to 550 kV? kW (b) What fraction of the input power is lost to the line under these circumstances? Ploss / P = (c) What difficulties would be encountered in attempting to transmit the 5.00 MW at the generator voltage of 4.50 kV?

Chapter 15 Solutions

University Physics Volume 2

Ch. 15 - Explain why at high frequencies a capacitor acts...Ch. 15 - In an RLC series circuit, can the voltage measured...Ch. 15 - For what value of the phase angle between the...Ch. 15 - Discuss the differences between average power and...Ch. 15 - The average ac current delivered to a circuit is...Ch. 15 - Can the instantaneous power output of an ac source...Ch. 15 - The power rating of a resistor used in ac circuits...Ch. 15 - Why do transmission lines operate at very hig1...Ch. 15 - How can you distinguish the primary winding from...Ch. 15 - Battery packs in some electronic devices are...Ch. 15 - Will a transformer work if the input is a dc...Ch. 15 - Why are the primary and secondary coils of a...Ch. 15 - Write an expression for the output voltage of an...Ch. 15 - Calculate the reactance of a 5.0F capacitor at (a)...Ch. 15 - What is the capacitance of a capacitor whose...Ch. 15 - Calculate the reactance of a 5.0-mH inductor at...Ch. 15 - What is the self-inductance of a coil whose...Ch. 15 - At s1iat frequency is the reactance of a 20F...Ch. 15 - At 1000 Hz, the reactance of a 5.0-mH inductor is...Ch. 15 - A 50resistor is connected across the emf...Ch. 15 - A 25F capacitor is connected to an emf given by...Ch. 15 - A 100-mH inductor is connected across the emf of...Ch. 15 - What is the impedance of a series combination of a...Ch. 15 - A resistor and capacitor are connected in series...Ch. 15 - A resistor and inductor are connected in series...Ch. 15 - In an RLC series circuit, the voltage amplitude...Ch. 15 - An PLC series circuit with R=600 , L = 30 mH. and...Ch. 15 - For the cucu3t shown below, what are (a) the total...Ch. 15 - The emf of an ac source is given by v(t)=v0sint....Ch. 15 - Calculate the rms currents for an ac source is...Ch. 15 - A 40-mH inductor is connected to a 60-Hz AC source...Ch. 15 - For an RLC series circuit, the voltage amplitude...Ch. 15 - An ac source of voltage amplitude 10 V delivers...Ch. 15 - An RLC series circuit has an impedance of 60 and a...Ch. 15 - Calculate the resonant angular freqency of an RLC...Ch. 15 - The resonant frequency of RLC series circuits is...Ch. 15 - (a) What is the resonant frequency of an RLC...Ch. 15 - For an RLC series circuit, R=100 , L = 150 mH, and...Ch. 15 - An ac source of voltage amplitude 100 V and...Ch. 15 - (a) What is the resonant frequency of a resistor,...Ch. 15 - Suppose a coil has a self-inductance of 20.0 H and...Ch. 15 - An ac generator is connected to a device whose...Ch. 15 - A step-up transformer is designed so that the...Ch. 15 - A step-up transformer connected to a 100-V line U...Ch. 15 - An ac source of emf delivers 5.0 mW of power at an...Ch. 15 - A transformer is used to down 110 V from a wall...Ch. 15 - A transformer is used to supply a 12-V model train...Ch. 15 - The emf of an ac source is given by v(t)=V0sint,...Ch. 15 - A 700-pF capacitor is connected across an ac...Ch. 15 - A 20-mH inductor is connected across an AC source...Ch. 15 - A 30F capacitor is connected across a 60-Hz ac...Ch. 15 - A 7.0-mH induct is connected across a 60-Hz ac...Ch. 15 - What is the impedance of an RLC series circuit at...Ch. 15 - What is the resistance R in the circuit shown...Ch. 15 - An ac source of voltage amplitude 100 V and...Ch. 15 - In an RLC series circuit, R=200,L=1.0H ,...Ch. 15 - A power plant generator produces 100 A at 15 kV...Ch. 15 - Consider a power plant located 25 km outside a...Ch. 15 - Neon signs require 12-kV for their operation. A...Ch. 15 - The 335-kV ac electricity from a power...Ch. 15 - A 1.5k resistor and 30-mH inductor are connected...Ch. 15 - A 20 resistor, 50F capacitor, and 30-mH inductor...Ch. 15 - A 200- resistor, 150- F capacitor, and 23-H...Ch. 15 - Find the reactances of the following capacitors...Ch. 15 - An output impedance of an audio amplifier has an...Ch. 15 - Show that the SI unit for capacitive reactance is...Ch. 15 - A coil with a self-inductance of 16 mH and a...Ch. 15 - An RLC series circuit consists of a 50 resistor, a...Ch. 15 - An RLC series circuit consists of a 10 resistor,...Ch. 15 - Shown below are two circuits that act as crude...Ch. 15 - The two circuits shown below act as crude low-pass...
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