15A
YOUR ANSWER: Watts.
You are partially correct. But you seem to forget the unit of measurement for all
opposition to current flow.
Resistors are devices which offer a specified amount of opposition to current flow.
Don't forget that resistors are rated not only in watts, but also in their ohmic value.
Return on to frame 18A.
15B
YOUR ANSWER: 128.7 percent
You have erred in two ways.
First, you were told that no machine is ever 100 percent efficient.
Second, you didn't pay any attention to the formula for efficiency.
Once more, the formula for efficiency:
Efficiency = output x 100.
input
Now, let's solve the problem. We have a I-hp motor which requires 960 watts input
power:
a. Efficiency = output x 100.
input
b. Put in known values. Efficiency = 746 (watts/hp)
960 (input)
Efficiency =
percent.
After solving this problem correctly, continue on to frame 20A.
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