COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 28QAP
To determine
The number of turns of secondary as compared to that of primary.
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A transformer consist of a primary coil connected to a 120 V source that drive 4 A of current through the primary and a secondary wire that contains 1/3 as many turns as the primary wire. What is the current in the secondary wire if the transformer is 80% efficient?
An iron core transformer is as shown in the figure. The primary coil has Np = 2000 turns and
the secondary coil has N, = 5000 turns. The primary coil is driven by an A.C. power source
with an amplitude of 200 V at a frequency of 60 Hz. What is the amplitude of the potential
across the secondary coil?
Transformer Core
Primary
Coil
Secondary
Coil
VP
Np
Ns
Vs
Transformer Construction
A transformer is used to provide voltage to a neon sign. The input voltage is 120 V and the output
voltage is 600 V. The number of turns on the primary coil of the transformer is 300. The current
supplied to the transformer is 2.5 A.
What is the number of turns on the secondary coil and the current used in the neon sign?
The number of turns in the secondary coil is 60 and the current in the sign is 2.5 A
The number of turns in the secondary coil is 240 and the current in the sign is 0.5 A
The number of turns in the secondary coil is 60 and the current in the sign is 0.5 A
The number of turns in the secondary coil is 1500 and the current in the sign is 0.5 A
The number of turns in the secondary coil is 240 and the current in the sign is 2.5 A
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
Ch. 21 - Prob. 11QAPCh. 21 - Prob. 12QAPCh. 21 - Prob. 13QAPCh. 21 - Prob. 14QAPCh. 21 - Prob. 15QAPCh. 21 - Prob. 16QAPCh. 21 - Prob. 17QAPCh. 21 - Prob. 18QAPCh. 21 - Prob. 19QAPCh. 21 - Prob. 20QAPCh. 21 - Prob. 21QAPCh. 21 - Prob. 22QAPCh. 21 - Prob. 23QAPCh. 21 - Prob. 24QAPCh. 21 - Prob. 25QAPCh. 21 - Prob. 26QAPCh. 21 - Prob. 27QAPCh. 21 - Prob. 28QAPCh. 21 - Prob. 29QAPCh. 21 - Prob. 30QAPCh. 21 - Prob. 31QAPCh. 21 - Prob. 32QAPCh. 21 - Prob. 33QAPCh. 21 - Prob. 34QAPCh. 21 - Prob. 35QAPCh. 21 - Prob. 36QAPCh. 21 - Prob. 37QAPCh. 21 - Prob. 38QAPCh. 21 - Prob. 39QAPCh. 21 - Prob. 40QAPCh. 21 - Prob. 41QAPCh. 21 - Prob. 42QAPCh. 21 - Prob. 43QAPCh. 21 - Prob. 44QAPCh. 21 - Prob. 45QAPCh. 21 - Prob. 46QAPCh. 21 - Prob. 47QAPCh. 21 - Prob. 48QAPCh. 21 - Prob. 49QAPCh. 21 - Prob. 50QAPCh. 21 - Prob. 51QAPCh. 21 - Prob. 52QAPCh. 21 - Prob. 53QAPCh. 21 - Prob. 54QAPCh. 21 - Prob. 55QAPCh. 21 - Prob. 56QAPCh. 21 - Prob. 57QAPCh. 21 - Prob. 58QAPCh. 21 - Prob. 59QAPCh. 21 - Prob. 60QAPCh. 21 - Prob. 61QAPCh. 21 - Prob. 62QAPCh. 21 - Prob. 63QAPCh. 21 - Prob. 64QAPCh. 21 - Prob. 65QAPCh. 21 - Prob. 66QAPCh. 21 - Prob. 67QAPCh. 21 - Prob. 68QAPCh. 21 - Prob. 69QAPCh. 21 - Prob. 70QAPCh. 21 - Prob. 71QAPCh. 21 - Prob. 72QAPCh. 21 - Prob. 73QAPCh. 21 - Prob. 74QAPCh. 21 - Prob. 75QAPCh. 21 - Prob. 76QAPCh. 21 - Prob. 77QAPCh. 21 - Prob. 78QAPCh. 21 - Prob. 79QAPCh. 21 - Prob. 80QAPCh. 21 - Prob. 81QAPCh. 21 - Prob. 82QAPCh. 21 - Prob. 83QAPCh. 21 - Prob. 84QAPCh. 21 - Prob. 85QAP
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- An ac source of emf delivers 5.0 mW of power at an rms current of 2.0 mA when it is connected to the primary cod of a transformer. The rms voltage across the secondary coil is 20 V. (a) What are die voltage across the primary coil and the current through the secondary coil? (b) What is the ratio of secondary to primary turns for the transformer?arrow_forwardA 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?arrow_forwardA 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?arrow_forward
- 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 ?arrow_forwardA transformer is used to provide voltage to a neon sign. The input voltage is 120 V and the output voltage is 600 V. The number of turns on the primary coil of the transformer is 300. The current supplied to the transformer is 2.5 A. What is the number of turns on the secondary coil and the current used in the neon sign? a. The number of turns in the secondary coil is 240 and the current in the sign is 2.5 A b. The number of turns in the secondary coil is 60 and the current in the sign is 2.5 A c. The number of turns in the secondary coil is 240 and the current in the sign is 0.5 A d. The number of turns in the secondary coil is 60 and the current in the sign is 0.5 A e. The number of turns in the secondary coil is 1500 and the current in the sign is 0.5 Aarrow_forwardIn the options given below, the winding number of the primary coils of all transformers that are considered lossless is N1 = 1000. Sort the number of winding (N2) in the secondary coils of these transformers from large to small. a) a transformer that converts 16 V to 32 V,b) a transformer that converts 320 V to 80 V,c) a transformer that converts 8 A to 2 A,d) a transformer that converts 2 V to 40 V.e) sorting winding numbersarrow_forward
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