Answer
$0.201$ horsepower
Work Step by Step
The power used is $VI = 120$ $W$. Since the alternator is 80% efficient, the input mechanical power must be $120/0.8 = 150$ $W$, which is equal to $0.201$ horsepower.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 26 - Current and Resistance - Problems - Page 769: 66
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