EXAMPLE 21-10 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 (Section 19-4). (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 700 mA. Calculate (a) the number of turns in the primary coil, (b) the current in the primary, and (c) the power transformed.

EXAMPLE 21-10 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 (Section 19-4). (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 700 mA. Calculate (a) the number of turns in the primary coil, (b) the current in the primary, and (c) the power transformed.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

1
EXAMPLE 21–10 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 (Section 19–4). (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 700 mA.
Calculate (a) the number of turns in the primary coil, (b) the current in the
primary, and (c) the power transformed.

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