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How to Calculate Energy Efficiency: Easy Step-by-Step Formula Explained

Learn how to calculate energy efficiency using a simple formula to measure useful energy output vs total energy input for accurate results.

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Video transcript

To calculate energy efficiency, use the formula: Efficiency (%) = (Useful Energy Output / Total Energy Input) x 100. This simple calculation helps you understand how well a system converts energy input into useful work. For instance, if a light bulb uses 100 watts of electrical energy but only emits 20 watts as light, its efficiency is (20/100) x 100 = 20%. Ensure you measure both energy input and output in the same units for accuracy.

Questions and answers

  1. What is the formula for calculating energy efficiency?

    Energy efficiency is calculated by dividing the useful energy output by the total energy input and multiplying by 100 to get a percentage: Efficiency (%) = (Useful Energy Output / Total Energy Input) x 100.

  2. Why is energy efficiency important?

    Energy efficiency helps to reduce energy waste, lower costs, and minimize environmental impact by ensuring systems convert more input energy into useful work.

  3. How do you measure useful energy output and total energy input?

    Both useful energy output and total energy input must be measured in the same units, such as watts or joules, depending on the context and device being analyzed.

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