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A transformer has an efficiency of 80%. It works at 4 kW and 100 V. If the secondary voltage is 240 V, the current in the primary coils is (a) 5 A (b) 7 A (c) 15 A (d) 40 A

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 2STP

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Question

Fast

A transformer has an efficiency of 80%. It
works at 4 kW and 100 V. If the secondary
voltage is 240 V, the current in the primary
coils is
(a) 5 A
(b) 7 A
(c) 15 A
(d) 40 A

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