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Worksheetsconservation of energy
Total questions: 10
Worksheet time: 20mins
Name
Class
Date
1.
According to the law of conservation of energy, energy can be created or destroyed.
a)
True
b)
False
2.
Identify the energy transfer
a)
chemical to kinetic
b)
solar to electrical
c)
thermal to light
d)
electrical to light
3.
What units are used to measure energy?
a)
Watts
b)
Newtons
c)
Joules
d)
kilowatts
4.
What is this diagram called?
a)
Stankey Diagram
b)
Sankey Diagram
c)
Sankay Diagram
d)
Samkay Diagram
5.
Where does most of the energy go in this transformation.
a)
Electrical energy
b)
Light
c)
Heat
d)
other
6.
Where does most of the energy go for this transformation.
a)
heat
b)
electrical
c)
light
d)
joules
7.
What type of device might this Sankey be about?
a)
A very efficient LED light bulb
b)
A very inefficient incandescent light bulb
c)
A coal power plant
d)
A wind turbine
8.
The energy efficiency shown in this diagram is:
a)
About 10%.
b)
About 30%.
c)
About 60%.
d)
Impossible to tell.
9.
A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?
a)
5%
b)
50%
c)
55%
d)
100%
10.
An iPhone charger coverts 75J of electricty in to 50J of charge and 25J of thermal energy. How efficient is the charger?
a)
10%
b)
100%
c)
33%
d)
67%
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