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 - General Problems - Page 623: 78

Answer

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Work Step by Step

a. Use Ohm’s law to find the current. $$I=\frac{V}{R}-\frac{120V}{3.0\Omega}=40A$$ b. As discussed on page 599, find the back emf from the normal operating current. $$\epsilon_{applied}-\epsilon_{back}=IR$$ $$\epsilon_{back}=\epsilon_{applied}-IR=120V-(2.0A)(3.0\Omega)=114V$$ c. Use equation 18–6a to find the power dissipated under normal use. $$P=I^2R=(2.0A)^2(3.0\Omega)=12W$$ d. Use equation 18–6a to find the power dissipated in the motor coils when the blender is jammed. $$P=I^2R=(40A)^2(3.0\Omega)=4800W$$
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