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4.5 describe a variety of everyday and scientific devices and situations, explaining the fate of the input energy in terms of the above relationship (see 4.4), including their representation by Sankey diagrams
Answers
Kettle
1) Wasted heat = 400 J
Heat to water= 1000J
Sound energy= 600J
2)
Useful Energy output / Useful Energy input X 100
1000/2000 X 100 = 50%
Computer
1) 150 - 20 - 10 = 120J
2)Useful Energy output / Useful Energy input X 100
120/150 X 100 = 80%
4.5 describe a variety of everyday and scientific devices and situations, explaining the fate of the input energy in terms of the above relationship (see 4.4), including their representation by Sankey diagrams
Answers
Kettle
1) Wasted heat = 400 J
Heat to water= 1000J
Sound energy= 600J
2)
Useful Energy output / Useful Energy input X 100
1000/2000 X 100 = 50%
Computer
1) 150 - 20 - 10 = 120J
2)Useful Energy output / Useful Energy input X 100
120/150 X 100 = 80%
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