While out for a walk with his mother, Lance notices a large, cylindrical gray box high atop a telephone pole. His mother explains that it is a transformer. This transformer takes 6000 V from the power company and steps it down to the 240 V supplied to each of the houses on the street, with the use of a secondary coil containing 100 turns. How many turns are there in the primary coil?

While out for a walk with his mother, Lance notices a large, cylindrical gray box high atop a telephone pole. His mother explains that it is a transformer. This transformer takes 6000 V from the power company and steps it down to the 240 V supplied to each of the houses on the street, with the use of a secondary coil containing 100 turns. How many turns are there in the primary coil?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 53P: The current in a long solenoid of radius 3 cm is varied with time at a rate of 2 A/s. A circular...

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Similar questions

(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?
The current in a long solenoid of radius 3 cm is varied with time at a rate of 2 A/s. A circular loop of wire of radius 5 cm and resistance 2 surrounds the solenoid. Find the electrical current induced in the loop.
(a) A car generator turns at 400 rpm when 1he engine is idling. Its 300-turn, 5.00 by 8.00 cm rectangular coil rotates in an adjustable magnetic field 50 that it can produce suf?cient voltage even at low rpms. What is the field strength needed to produce a 24.0 V peak emf? (b) Discuss how this required field strength compares to those available in permanent and electromagnets.
A multipurpose transformer has a secondary coil with several points at which a 1inziltage can be extracted, giving outputs of 5.60, 12.0, and 480 V. (a) The input voltage is 240 V to a primary coil of 280 turns. What are the numbers of turns in the parts of the secondary used to produce the output voltages? (b) If the maximum input current is 5.00 A, what are the maximum output currents (each used alone)?
1. An AC generator has 85 rectangular loops on its armature. Each loop is 11 cm long and 8 cm wide. The armature rotates at 1500 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.8 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? Volts
A transformer has 200 turns on the primary and 20 turns on the secondary. The primary is connected to a direct current source of 100 millivolts. The voltage in the secondary coil will be 20 millivolts.zero. 1000 millivolts.4000 millivolts.10 millivolts.
7. An electric power station that operates at 25 kV and uses a 10:1 step-up ideal transformer is producing 36 MW (Mega- Watt) of power that is to be sent to a big city which is located 270 km away with only 1.5% loss. Each of the two wires are made of copper (resistivity = 1.72 × 10−8 №.m). What is the diameter of the wires? cm
1. While out for a walk with his mother, Lance notices a large, cylindrical gray box high atop a telephone pole. His mother explains that it is a transformer. This transformer takes 6000 V fromthe power company and steps it down to the 240 V supplied to each of the houses on the street, with the use of a secondary coil containing 100 turns. How many turns are there in the primary coil?
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?
9. A car generator turns at 380 rpm when the engine is idling. Its 310-turn, 6.00 by 8.00 cm rectangular coil rotates in an adjustable magnetic field so that it can produce sufficient voltage even at low rpms. What is the field strength needed (in T) to produce a 24.0 V peak emf? T Discuss how this required field strength compares to those available in permanent and electromagnets.
Ex.3-Cell phone charger. The charger for a cell phone contains a transformer that reduces 120- V (or 240-V) ac to 5.0-V ac to charge the 3.7-V battery. (It also contains diodes to change the 5.0-V ac to 5.0-V dc.) 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, and (c) the power transformed.
Spike left his car headlights on overnight and the battery has gone flat. Carly suggests that rather than using her car to recharge the battery they instead build a battery charger so he can do it himself. She suggests that he modify an old transformer that they don't need anymore to do the job. The old transformer has a primary coil of 309 turns. It will need to be connected to mains voltage (240 V) and put out a voltage of 11 V to charge the car battery. How many turns should Spike wind to make the secondary coil? (No decimals, no units)