# 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

Builds on: Energy can't be created or destroyed (hard, https://ai.page/c/energy-can-t-be-created-or-destroyed/en.md), Resultant Forces (soft, https://ai.page/c/resultant-forces/en.md), Calculating Percentages (soft, https://ai.page/c/calculating-percentages/en.md)

Concept id: efficiency-sankey-diagrams-and-work-done. Subject: science. Licence: CC BY-SA 4.0.

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