Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 21 - Electromagnetic Induction and Faraday's Law - Problems - Page 621: 28

Answer

$\frac{1}{3}$ 3 times

Work Step by Step

Because the secondary has fewer turns than the primary, this is a step-down transformer. Use equation 21-6 to find the voltage ratio. $$\frac{V_S}{V_P}=\frac{N_S}{N_P}$$ $$=\frac{120 turns}{360 turns}=\frac{1}{3}$$ From equation 21–7 we see that the current ratio is the reciprocal, 3.0. The secondary current is 3.0 times the primary current.
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