
Energy Efficiency and Conversion Concepts
Interactive Video
•
Physics
•
9th - 10th Grade
•
Practice Problem
•
Hard
Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of a device in terms of energy?
To create energy
To convert one form of energy into another
To destroy energy
To store energy
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the candle example, which type of energy is considered useful?
Mechanical energy
Light energy
Heat energy
Chemical energy
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the efficiency of a device?
Multiply useful energy by total energy
Divide total energy by useful energy
Divide useful energy by total energy
Subtract wasted energy from total energy
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a filament bulb is supplied with 100 joules of electrical energy and converts 45 joules into light, how much energy is wasted?
45 joules
55 joules
100 joules
0 joules
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a larger light energy bar in a Sankey diagram indicate?
More energy is wasted
The device is less efficient
The device is more efficient
The device uses more energy
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does an A++ energy efficiency label signify?
0-20% efficiency
85% efficiency
Over 95% efficiency
50% efficiency
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it beneficial to use more efficient devices?
They are cheaper to buy
They convert more energy into useful forms
They are larger in size
They consume more energy
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