lesson 2 sankey diagrams and efficiency
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Lesson 2 Sankey diagrams and efficiencyTRANSCRIPT
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Do now!Can you remember all the
“Types of energy” we looked at last lesson?
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Energy transfer (change)
A lamp turns electrical energy into heat and light energy
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Energy transfer (change)
electrical light + heat
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Sankey Diagram
A Sankey diagram helps to show how much light and heat energy is produced
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Sankey Diagram
The thickness of each arrow is drawn to scale to show the amount of energy
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Sankey Diagram
Notice that the total amount of energy before is equal to the total amount of energy after (conservation of energy)
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Efficiency
Although the total energy out is the same, not all of it is useful.
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Efficiency
Efficiency is defined as
Efficiency (%) = useful energy output x 100
total energy input
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Efficiency
Efficiency is defined as
Efficiency (%) = useful energy output x 100
total energy input
Can you copy this (with title) please?
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Example
Efficiency = 75 x 100 = 15%
500
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Energy efficient light bulb
Efficiency = 75 x 100 = 75%
100
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Energy efficient light bulb
Efficiency = 75 x 100 = 75%
100 That’s much better!
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More complex examples
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Let’s try some questions!
Stick the sheet into your books and answer the questions