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In this lesson, we will learn how to correctly draw and interpret Sankey diagrams for processes that involve the transfer of energy.
Diagram (a) is a Sankey diagram of a 1.8 kW kettle. Diagram (b) is a Sankey diagram
of an 80 W light bulb.
Which device is more efficient?
What is the efficiency of the kettle?
What is the efficiency of the light bulb?
The image shows a Sankey diagram for a light bulb that is supplied with
100 J of energy, where
80 J of energy is wasted as heat.
What is the useful energy output of the bulb?
The image shows a Sankey diagram for a 1.7 kW kettle turned on for 3 minutes.
Is the majority of the energy supplied to the kettle wasted or transferred usefully?
The image shows a Sankey diagram for a light bulb that has been drawn incorrectly. In which
of the following ways has the diagram been drawn incorrectly?
The image shows a Sankey diagram for a car motor that is supplied with
J of energy, where
480 J of the energy is converted
into useful kinetic energy. How much energy is wasted?
The image shows a Sankey diagram of a 100 W light bulb.
What does 1 square of the diagram represent?
How much energy is wasted as heat by the light bulb?
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