ScienceEnergyAges 12–13
Efficiency, Sankey diagrams, and work done
Calculate energy efficiency as the ratio of useful output energy to total input energy, construct and interpret Sankey diagrams, and calculate work done using work = force × distance
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
No reviewed resources for this concept yet.
The teaching approach above still stands. Curated practice links will appear here as the shelf fills.
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This concept
Efficiency, Sankey diagrams, and work doneProcedural concept
Check understanding
- Calculates efficiency as a percentage from given input and useful output energy values
- Draws a Sankey diagram to represent energy transfers in a device, with arrow widths proportional to energy amounts
- Uses W = Fd to calculate work done when a force moves through a distance
- Identifies which energy transformations in a Sankey diagram are useful and which are wasted
“If your child heard that a light bulb is 10% efficient and uses 60 J of energy, could they work out how much of that energy actually becomes light — and where the rest goes?”
Curriculum record
- Type
- Procedural
- Subject
- Science
- Domain
- Energy
- Age range
- Ages 12–13
Standards
uk-nc-2013:KS3.Sci.Phys.Energy.3