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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
18
Electric Currents
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18-2 and 18-3: Electric Current, Resistance, Ohm's Law
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18-4: Resistivity
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18-5 and 18-6: Electric Power
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18-8: Microscopic View of Electric Current
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 32
Q

An electric car uses a 45-kW (160-hp) motor. If the battery pack is designed for 340 V, what current would the motor need to draw from the battery? Neglect any energy losses in getting energy from the battery to the motor.

A
130 A130 \textrm{ A}
Giancoli 7th Edition, Chapter 18, Problem 32 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. To find the current travelling through this electric current motor, we'll divide both sides of this formula, P equals IV, by V. And on one side, we get I isolated, and then this side we have power divided by voltage. So the current is 45 times 10 to the three watts, divided by 340 volts, which is a 130 amps.

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