24A
YOUR ANSWER: 107.23 percent.
We can't very well go along with your answer, since we already have told you that NOL
machine is ever 100 percent efficient.
Our problem is to solve for the efficiency of a 4-hp. motor drawing 20 amperes from a
200-volt circuit. O.K., let's solve it.
a. P=E x l.
b. P = 200 x 20 = 4,000 watts.
c. Efficiency = output x 100.
input
d. Efficiency = 5 x 746 (watt, hp) x 100.
4,000 watts
e. Efficiency =
percent.
After you solve this problem correctly, continue on to frame 22A.
1-25
IT0348
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