Sankey Diagrams Aim: To create Sankey diagrams to describe energy transfers. Keywords: Transformation, Efficiency Energy Transfer: The movement of a single form of energy from place to place, or one body to another. Energy Transformations: The change of one form of energy into another form of energy. Focus Question: "How do we illustrate energy transformations?" Energy transformations can be recorded and illustrated using a Sankey diagram. A Sankey diagram is a scaled chart in which the width of the arrow corresponds to the amount of energy. Looking at the example below, first we note that each square has a value of 100J. This means that with the size of the input arrow being 12 squares wide, the input energy is 12 x 100 = 1200J. In a Sankey diagram, the useful energy is represented by an arrow to the right, and any energy wasted is represented with an arrow dropping down from the input energy. The width of the body of the arrow on the right is 9 squares wide. This equates to a total of 900J of useful energy produced.. We also notice the smaller arrow on the bottom. This arrow has a width of 3 squares wide. This means that a total of 300J of energy is lost. Now if we use the formula located at the top of the worksheet, which we also covered last lesson, we can calculate that 900J of useful energy divided by 1200J of input energy, multiplied by 100, is 75. This means that the kettle has an energy efficiency of 75%. Lesson Summary
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