EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 29, Problem 64GP
Show that the power loss in transmission lines, PL, is given by
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A power transmission line is used to transmit 100 kW of power at a voltage of 10 kV with a loss of 1 kW. If the voltage is increased to 200 kV, what is power loss to transmit the same amount of power?
The average television is said to be on 6 hours per day. Estimate the yearly cost of electricity to operate 100 million TVs, assuming their power consumption averages 150 W and the cost of electricity averages 12.0 cents/kW ⋅ h .
One wire in a high-voltage transmission line carries 1 000 A starting at 700 kV for a distance of 100 mi. If the resistance in the wire is 0.500 Ω/mi, what is the power loss due to the resistance of the wire?
Chapter 29 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
Ch. 29 - Prob. 1QCh. 29 - What is the difference between magnetic flux and...Ch. 29 - Suppose you are holding a circular ring of wire...Ch. 29 - The use of higher-voltage lines in homessay, 600 V...Ch. 29 - (II) (a) If the resistance of the resistor in Fig....Ch. 29 - Prob. 30PCh. 29 - (III) A short section of wire, of length a, is...Ch. 29 - (I) Neon signs require 12 kV for their operation....Ch. 29 - Prob. 62GPCh. 29 - Show that the power loss in transmission lines,...
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- A power transmission line carries 520 A of current at a voltage of 924 kV. If the line has a resistance of 48 u/m, what is the rate at which energy is being dissipated (in kW) over 509 km of line?arrow_forwardA high-voltage transmission line with a resistance of 0.315 Ω/km carries a current of 1.45 kA. The line is at a potential of 750 kV at the power station and carries the current to a city located 161 km from the power station. What is the power loss due to resistance in the line? What fraction of the transmitted power does this loss represent?arrow_forwardThe current in an RL circuit drops from 1.0 A to 10 mA in the first second following removal of the battery from the circuit. If L is 10 H, find the resistance R in the circuit.arrow_forward
- (a) What current is needed to transmit 100 MW of power at a voltage of 25.0 kV?(b) Find the power loss in a 1.00 - Ω transmission line. (c) What percent loss does this represent?arrow_forward(a) What is the resistance of a lightbulb that uses an average power of 60.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170 V?(b) What is the resistance of a 150-W lightbulb? (Assume the lightbulb uses an average power of 150 W when connected to a power source having a maximum voltage of 170 V.)arrow_forwardThe average television set is said to be on 6 hours a day. a) Calculate the yearly cost (total cost) of electricity, in billions of dollars, required to operate 100 million TVs, assuming their power consumption averages 130 W and the cost of electricity averages 13.5 cents/kW⋅h.arrow_forward
- Let's say you have a 30W lightbulb that operates on a 120V alternating current. When the light is on the temperature is 2473 celsius. What would be the resistance at 2066 celsius? Note that the temperature coefficient α=4.5x10^-3/celsiusarrow_forwardSuppose the charge on a capacitor in a circuit is oscillating so that, Q(t) = Qmaxsin (wt), where Qmax = 2.54 μC, and w = 5.8 s-1 = 5.8 Hz? Write a symbolic expression for the current flowing on and off the capacitor, in terms of Qmax, w, and t, then calculate its numeric value at t = 6.5 sec. 1= @max cos (cot) HAarrow_forwardThe instantaneous values of alternating current and voltages in a circuit are given as - sin (100 πι) ampere e = sin (100 πt + π3) volt The average power in Watts consumed in the circuit is -arrow_forward
- A 1.5-V emf source has an internal resistance of 0.50 2. After it has been connected to a load with a resistance R, the terminal voltage dropped to 1.45 V. How much current is passing through the circuitarrow_forwardThe generator at a large power plant has an output of 1,400,000 kW at 28,000 V. (a) If it were a DC generator, what would be the current in it? A(b) What is its energy output each day—in joules and in kilowatt-hours? J kWh (c) If this energy is sold at a price of 10 cents per kilowatt-hour, how much revenue does the power plant generate each day?arrow_forwardA capacitor in a telephone circuit has a capacitance of 3μF. What current flows through it when 15V at 800Hz is impressed across it? answer should be in polar formarrow_forward
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