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Energy efficiency calculations and improvements

Principles of energy • Conservation and dissipation of energy

Key concepts

What you'll likely be quizzed about

  • Energy efficiency is defined as the ratio of useful energy output to the total energy input, expressed as a percentage.
  • For example, if a device uses 100 joules of energy and produces 80 joules of useful work, the energy efficiency is 80%.
  • This metric enables the evaluation of how effectively energy resources are utilized in various applications.

Flashcards

Test your knowledge with interactive flashcards

What is waste energy?

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Waste energy is energy that is not converted into useful work and is often dissipated as heat.

Key notes

Important points to keep in mind

Energy efficiency is expressed as a percentage.

Higher efficiency means less wasted energy.

Insulation is key for efficiency in buildings.

Energy-efficient appliances save money.

Regular maintenance can enhance efficiency.

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