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Homework: Presentations for Transfer of Energy on April 24 th.

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Wasted Energy

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Energy transfer (change) A lamp turns electrical energy into heat and light energy

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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 outputx 100 total energy input

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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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Read in silence pages 133-136.

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