A phone charger contains a step-down transformer with input voltage of 120V. The required charging current for the phone is 12 A with voltage of 12 V. What should the ratio of the number of turns in the primary coil to the number of turns in the secondary coil in the transformer?

A phone charger contains a step-down transformer with input voltage of 120V. The required charging current for the phone is 12 A with voltage of 12 V. What should the ratio of the number of turns in the primary coil to the number of turns in the secondary coil in the transformer?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter25: Electromagnetic Induction

Section: Chapter Questions

Problem 60A

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Question

A phone charger contains a step-down transformer with input voltage of 120V. The required
charging current for the phone is 12 A with voltage of 12 V.
What should the ratio of the number of turns in the primary coil to the number of turns in the
secondary coil in the transformer?
O (Np/Ns)= 21
O (Np/Ns)= 6
O (Np/Ns)= 2
O (Np/Ns)= 10
O (Np/Ns)= 19

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