Sankey Diagrams

Quinn Quillfeather
Note by Quinn Quillfeather, updated more than 1 year ago
Quinn Quillfeather
Created by Quinn Quillfeather almost 5 years ago
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Description

Notes on how to work out efficiency and how to set out a Sankey diagram.

Resource summary

Page 1

Sankey diagrams are diagrams to show how the energy input into something is used. For example, if 100J (100 Joules) of electrical energy is input, and 90J is (wasted) heat energy and the other 10J is light energy, we could demonstrate it on a Sankey diagram, like this:

The width of the arrows symbolise how many joules are being used as that type of energy - say if on our diagram 1cm = 10J, we would make the arrow for heat energy 9cm long to show that the amount of electrical energy being transferred into heat energy is 90j.

Efficiency

Efficiency can be calculated using the formula: useful energy output / total energy input.It can be measured in either percentage or decimal format.

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