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IB Physics HL A 3 3 Sankey Diagrams Questions

Practise interpreting HL Sankey diagrams by comparing useful output, transmission losses and overall efficiency percentages.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Interpret Sankey percentages and arrow widths to identify useful energy output, transmission losses and overall efficiency.
  • Construct and label a Sankey diagram with arrow widths proportional to the stated input, useful output and losses.

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Study A.3.3—Sankey diagrams conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL A 3 3 Sankey Diagrams Questions question 1

[Maximum number: 1]

The Sankey diagram shows the energy input from fuel that is eventually converted to useful domestic energy in the form of light in a filament lamp.

Figure for Question IB Physics HL A 3 3 Sankey Diagrams Questions question 1 — IB Physics HL

What is true for this Sankey diagram?

A

The overall efficiency of the process is 10 %.

B

Generation and transmission losses account for 55 % of the energy input.

C

Useful energy accounts for half of the transmission losses.

D

The energy loss in the power station equals the energy that leaves it.

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