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Sankey diagrams and efficency
Sankey diagrams and efficency
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Quick test of knowledge of Sankey diagrams and efficency
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1
What is the law of conservation of energy?
Energy cannot be created or destroyed
Energy can be created at a powerstation
Energy can be destroyed if it is wasted
Energy cannot be transformed
2
A TV converts 2000J of energy into useful energy, it is 65% efficient. Calculate useful energy.
30J
0.3J
130000J
1300J
3
What is efficiency?
The total work done divided by the useful energy out
How well something works
A ratio of the useful energy out to the total input energy
How much useful work can be done
4
What is type of energy is the wasted energy on this Sankey diagram?
Thermal
Light
Sound
Electrical
5
In a Sankey diagram, what represents the amount of energy?
The colour of the arrow
The area of the arrow
The length of the arrow
The width of the arrow
6
How much energy is wasted in this sankey diagram?
110J
10J
100J
90J
7
What is the percentage efficiency of the device in the Sankey diagram?
10%
75%
100%
90%
8
A mac is 80% efficient. Calculate energy inputed when it produces 500J of useful energy.
1.6J
6.25J
625J
400J
9
What type of energy is stored in a torch battery?
Electrical
Elastic strain
Potential
Chemical
10
What is the useful energy conversion when you are running?
Kinetic to Chemical
Chemical to Thermal
Kinetic to Thermal
Chemical to Kinetic
11
What is the wasteful energy conversion when you are running?
Kinetic to Thermal
Chemical to Thermal
Chemical to Kinetic
Kinetic to Chemical
