What percentage of energy supplied to the light bulb is considered useful energy?
Calculating Efficiency and Energy Transfers in Devices
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Physics, Science
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10th Grade - University
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Hard
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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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3 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
Discuss the significance of wasted energy in the context of energy efficiency.
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
How is the useful energy output of an electric fan calculated based on its efficiency?
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