Calculating Efficiency and Energy Transfers in Devices

The video tutorial explains how to calculate the efficiency of devices using Sankey diagrams, which illustrate energy transfers. It provides examples with a car engine, a light bulb, and an electric fan. The efficiency is calculated by dividing the useful energy output by the total energy output and multiplying by 100%. The tutorial demonstrates this process with detailed examples, showing how to identify useful and wasted energy forms and calculate efficiency percentages.

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