An electric power station that operates at 30 KV and usesa 15:1 set step-up ideal transformer is producing 400MW(Mega-Watt) of power that is to be sent to a big citywith only 2.0% loss. Whatwhich is located 270 kmawayis the resistance of the Two wires that arebeing used?52

Step 1:Given Data:Voltage at power station: Vp = 30 kVTransformer turns ratio: 15:1 (step-up)Power…

Answered: An electric power station that operates…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter25: Electromagnetic Induction

Section: Chapter Questions

Problem 29A

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A small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor draws 4.0 A, and when the armature is clamped so that it cannot turn, the motor draws 24 A. What is the back emf when tire motor is operating normally?
Check Your Understanding A transformer steps the line voltage down from 110 to 9.0 V so that a current of 0.50 A can be delivered to a doorbell (a) What is the ratio of the number of turns in the primary and secondary windings? (b) What is the current in the primary winding? (c) What is the resistance seen by the 110-V source?
Check Your Understanding. A changing current induces an emf of 10 V across a 0.25-H inductor. What is the rate at which the current is changing?
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A 120-V, series-wound motor has a field resistance of 80 and an armature resistance of 10. When it is operating at full speed, a back emf of 75 V is generated, (a) What is the initial current drawn by the motor? When the motor is operating at full speed, where are (b) the current drawn by the motor, (c) the power output of the source, [ d) the power output of the motor, and (e) the power dissipated in the two resistances?
In 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?
A steady current flows through a circuit with a large induct3ve time constant. When a switch in the circuit is opened, a large spark across the terminals of the switch. Explain.
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Does the induced emf always act to decrease the magnetic flux through a circuit?
The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?

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An electric power station that operates at 30 KV and uses a 15:1 set step-up ideal transformer is producing 400MW (Mega-Watt) of power that is to be sent to a big city with only 2.0% loss. What which is located 270 km away is the resistance of the Two wires that are being used? 52