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.

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IT0348

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