Energy Efficiency Calculations
Authored by Lisa Thompson
Science
8th Grade
NGSS covered
Used 6+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A car uses 100 J of gasoline. 83 J are turned into mechanical energy. How much should be turned into heat?
7 J
17 J
83 J
100 J
Tags
NGSS.MS-PS3-5
NGSS.MS-PS3-4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does this equation mean? \(\frac{useful\ output}{input}\ \times\ 100\%\)
Efficiency is the fraction of output energy that is useful, compare to how much energy you put in.
Nothing, it's just math.
Efficiency compares what useful energy you get out to how much you have to put in.
Efficiency compares how much you put in to how much you get out, whether it is the type you want or not.
Tags
NGSS.MS-PS3-5
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A TV uses 200 J of electricity and transforms it into 125 J of sound and light and 75 J of heat. How efficient is it?
62.5%
.625%
37.5%
.375%
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
My dog likes to run and bark. If he eats 1000 J of food, and transforms that into 700 J of kinetic energy, 100 J of sound, and 200 J of heat, what is his efficiency?
80%
70%
20%
Tags
NGSS.MS-PS3-5
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
6.26%
54%
100%
260%
Tags
NGSS.MS-PS3-5
NGSS.MS-PS3-4
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
100%
80%
40%
10%
Tags
NGSS.MS-PS3-3
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
100%
80%
40%
20%
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