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.
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.
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 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.
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