EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 29, Problem 47P
(I) Neon signs require 12 kV for their operation. To operate from a 240-V line, what must be the ratio of secondary to primary turns of the transformer? What would the voltage output be if the transformer were connected backward?
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(I) Neon signs require 12 kV for their operation. To operatefrom a 240-V line, what must be the ratio of secondary toprimary turns of the transformer? What would the voltageoutput be if the transformer were connected in reverse?
(II) A transformer has 330 primary turns and 1240 secondaryturns. The input voltage is 120 V and the output current is15.0 A. What are the output voltage and input current?
(II) The output voltage of a 95-W transformer is 12 V, andthe input current is 25 A. (a) Is this a step-up or a step-downtransformer? (b) By what factor is the voltage multiplied?
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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- Can there be an induced emf in a circuit at an instant when the magnetic flux through the circuit is zero?arrow_forwardCheck Your Understanding For the circuit of in Figure 14.12(b), show that when steady state is reached, the difference in the total energies produced by the battery and dissipated in the resistor is equal to the energy stored in the magnetic field of the coil.arrow_forwardDoes the induced emf always act to decrease the magnetic flux through a circuit?arrow_forward
- When the current through a large inductor is interrupted with a switch, an are appears across the open terminals of the switch. Explain.arrow_forwardWill a transformer work if the input is a dc voltage?arrow_forwardIn the circuit sho in the accompanying figure, the rtd slides along the conducting rails at a constant VelOCity v. The velocity is in the same plane as the rails and directed at an angle 6 to them. A uniform magnetic field Bis directed out of the page. What is the emf induced in the r?arrow_forward
- Check Your understanding Suppose that the coil of Example 13.2 is a square rather than circular. Can Equation 13.12 be used to calculate (a) the induced emf and (b) the induced electric field? =EdI=dmdt13.12arrow_forwardHow would changing the radius of loop D shown below affect its emf, assuming C and D are much closer together compared to their radii?arrow_forward(I) A transformer has 360 turns in the primary coil and 120in the secondary coil. What kind of transformer is this, andby what factor does it change the voltage? By what factordoes it change the current?arrow_forward
- (a) A 120 Vrms to 480 Vrms step-up transformer is connected to a 50 load. (i) (ii) (iii) Explain what a step-up transformer is and calculate the turns ratio of the transformer. What resistance does the 120 Vrms source see? What is the current in the primary winding and the current in the cocon ry winding?arrow_forward(I) A step-up transformer increases 25 V to 120 V. What isthe current in the secondary coil as compared to the primarycoil?arrow_forwardProblem 7)) Consider a transformer, used to recharge rechargeable flashlight batteries, that has 500 turns in its primary coil, 4 turns in its secondary coil, and an input voltage of 120 V. Note that n = 4 (a) Given that the input current I(p) is 0.0256 A, to produce a 3.2 A output current, convert 0.0256 A to milliamps. I(p) = Part (c) What is the power input, in watts? (Explain thoroughly whether or not you use amps or milliamps for this calculation)arrow_forward
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