At its normal operating speed, an electric fan motor draws only 15.0% of the current it draws

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At its normal operating speed, an electric fan motor draws only 15.0% of the current it draws when it just begins to turn the fan blade. The fan is plugged into a 120.0-V socket. What back emf does the motor generate at its normal operating speed?
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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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