PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
5th Edition
ISBN: 9780321992277
Author: GIANCOLI
Publisher: PEARSON
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Chapter 29, Problem 62GP

(a)

To determine

The current through the primary windings of the transformer.

(b)

To determine

The ratio of the number of the primary windings to the secondary windings of the transformer.

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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?
A transformer is used to charge a cell phone. The number of turns on the primary coil is 600. The voltage input is 120 V and the output needs to be 9.0 V. The output current is 40 milliamperes. What is the number of turns on the secondary coil and the current in the primary. Assume the transformer is 100% efficient. The number of turns on the secondary coil is 45 and the current in the primary is 533 milliamperes The number of turns on the secondary coil is 8000 and the current in the primary is 533 milliamperes The number of turns on the secondary coil is 45 and the current in the primary is 3.0 milliamperes. The number of turns on the secondary coil is 8000 and the current in the primary is 3.0 milliamperes
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