4.5 · 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
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[cid:image003.png@01CC30D5.57D66F20] Consider a kettle:
1) Wasted Heat: 400 J, Heat to Water: 1000 J, Sound Energy: 600 J
2) Efficiency = (Useful Eout/Total Ein)x100 = (1000/2000)x100 = 50% Consider a computer:
1) 150 - (20 + 10) = 120 J
2) Efficiency = (Useful Eout/Total Ein)x100 = (120/150)x100 = 80% 
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[cid:image003.png@01CC30D5.57D66F20] Consider a kettle:
1) Wasted Heat: 400 J, Heat to Water: 1000 J, Sound Energy: 600 J
2) Efficiency = (Useful Eout/Total Ein)x100 = (1000/2000)x100 = 50% Consider a computer:
1) 150 - (20 + 10) = 120 J
2) Efficiency = (Useful Eout/Total Ein)x100 = (120/150)x100 = 80%
Well done!
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