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

Sankey Diagrams.ppt Download this file

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4.4

4.4 recall and use the relationship:

efficiency = useful energy output / Total energy Input Version 1

Efficiency = Useful Eout / Total Ein x 100

Useful Eout = Useful Energy Output ( J )

Total Ein = Total Energy Input ( J )

Efficiency = Efficiency ( %)

Version 2

Efficiency = Useful Eout / Total Ein

Useful Eout = Useful Energy Output ( J )

Total Ein = Total Energy Input ( J )

Efficiency = Efficiency ( No Units; a number between 0 and 1 )

Efficiency.ppt Download this file

% efficiency energy.swf Download this file