You are planning a trip to Singapore. Your travel agent gives you the proper transformer to step down the voltage so you can use your electric appliances there. Curious, you open the case and find that the primary coil has 46 turns and the secondary has 24 turns. Assuming the output voltage is 120 volts, what is the standard household voltage in Singapore?

You are planning a trip to Singapore. Your travel agent gives you the proper transformer to step down the voltage so you can use your electric appliances there. Curious, you open the case and find that the primary coil has 46 turns and the secondary has 24 turns. Assuming the output voltage is 120 volts, what is the standard household voltage in Singapore?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter23: Electromagnetic Induction, Ac Circuits, And Electrical Technologies

Section: Chapter Questions

Problem 47PE: (a) What is the voltage output of a transformer used for rechargeable flashlight batteries, if its...

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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=100 . (a) What voltage is induced in the secondary winding? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?
(a) What is the voltage output of a transformer used for rechargeable flashlight batteries, if its primary has 500 turns, its secondary 4 turns, and the input voltage is 120 V? (b) What input current is required to produce a 4.00 A output? (c) What is the power input?
A 75-turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 radius in a 1.25 T field, starting with the plane of the coil parallel to the field. (a) What is the peak emf? (b) At what time is the peak emf first reached? (c) At what time is the emf first at its meet negative? (d) What is the period of the AC voltage output?
. The generator at a large power plant has an output of 1,000,000 kW at 24,000 V. (a) If it were a DC generator, what would he the current in it? (b) What is its energy output each day—in joules and in kilowatt—hours? (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?
A transformer is used to supply a 12-V model train with power from a 110-V wall plug. The train operates at 50 W of power, (a) What is the rms current in the secondary coil of the transformer? (b) What is me rms current in the primary coil? (c) What is the ratio of the number of primary to secondary turns? (d) What is the resistance of the tram? (e) What is the resistance seen by the 110-V source?
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A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25.0 V. what is the voltage across the secondary coil? Is this a step up or step down transformer? Explain. What is the effective load resistance of the secondary coil if it is connected across a 125 Ω resistor ?
The charger for a cell phone contains a transformer that reduces 120-V (or 240-V) ac to 5.0. Vac to charge the 3.7-V battery. (It also contains diodes to change the 5.0-Vac to 5.0-Vdc.) Suppose the secondary coil contains 30 turns and the charger supplies 700mA. Calculate: A. The number of turns in the primary coil. B. The current in the primary coil. C. The power transformed.
Suppose a large power plant generates electricity at 12.0 kV. Its old transformer once converted this voltage to 330 kV. The secondary coil of this transformer is being replaced so that its output can be 770 kV for more efficient cross-country transmission on upgraded transmission lines.1. If the overall power output is 1000.0 MW and line resistance is 2.00 Ω, what was the power loss, in watts, in the OLD power lines which left the plant? 2. If the overall power output is 1000.0 MW and line resistance is 2.00 Ω, what is the power loss, in watts, in the NEW power lines which leave the plant?
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4. A 6.0W ideal transformer is plugged into a 120 VAC wall outlet. The primary coil of the transformer has 200 turns and the secondary coil of the transformer has 40 turns. a. What is the output voltage of the transformer? b. What is the output current of the transformer?