Question

a) draw a sankey diagram for the following situation. An electric kettle is used to heat the water, 10kj raise the temperature of the kettle and 40 kj escape to heat the surroundings

b) calculate the efficiency of the kettle

Answer 1

Answer:20 percent

Explanation:

Efficiency is percentile of fraction of energy utilised to that of supplied

See the image for solutions

Answer 2

Answer:

Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity. The illustration shows a Sankey diagram which represents all the primary energy flows into a factory.

We supply electrical energy to an electric motor. An efficient motor transfers most of this energy as kinetic energy (useful work). Only a small fraction is wasted as it heats up the surroundings. ... Energy is lost as the electric current flows through the motor's coils.

Explanation:

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