PHYS - Sankey Diagrams and Energy Efficiency
Physics, Sankey diagrams, energy - IBDP | DSE | GCE | IAL | AP Physics
Sankey diagram is a way to depict flows of energy.
In IGCSE Physics, you will come across Sankey diagrams that look like this 👉
- On the left is the total energy input.
- Deviating from the horizontal energy flow to the top or bottom are energy losses.
- On the right is the useful energy output.
- The width of the arrow is proportional to the quantity of the flow.
To summarize 👉
Let's try to solve one example from IGCSE Physics past paper 💪
This is a Sankey diagram for the power station.
(i) State the relationship between efficiency, useful energy output and total energy input.
efficiency = (useful energy output) / (total energy input)
(ii) The efficiency of the power station is 36%. The total energy input is 1050 kJ. Calculate the total wasted energy in kJ.
0.36 = (useful energy output) / 1050kJ
useful energy output = 0.36 x 1050kJ = 378 kJ
total wasted energy = 1050kJ - 378kJ = 672kJ
(iii) Name two forms of wasted energy in this power station.
thermal energy, noise/sound, frictional heating, etc.
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