Physics Tutorial 5.5 - Power and Efficiency

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There are 3 lessons in this physics tutorial covering Power and Efficiency. The tutorial starts with an introduction to Power and Efficiency and is then followed with a list of the separate lessons, the tutorial is designed to be read in order but you can skip to a specific lesson or return to recover a specific physics lesson as required to build your physics knowledge of Power and Efficiency. you can access all the lessons from this tutorial below.

In this Physics tutorial, you will learn:

  • What is mechanical power and why it is so important in physics?
  • What is the difference between output and input power?
  • What does wasted energy mean?
  • What is efficiency of a machine and how can we calculate it?
  • How is mechanical power calculated in terms of force and velocity?


Suppose you are the owner of a company that imports goods using trade ships and you are looking to hire a stevedore. Two candidates have applied for this job. The first candidate manages to discharge the goods from the ship in 8 hours while the other candidate completes the same job in 6 hours. Which candidate you are most likely to hire? Why?

Now, think about having a limited time to discharge as much goods as possible from the ship. Which from the abovementioned stevedores is more suitable for this task? Why?

Please select a specific "Power and Efficiency" lesson from the table below, review the video tutorial, print the revision notes or use the practice question to improve your knowledge of this physics topic.

Work, Energy and Power Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
5.5Power and Efficiency
Lesson IDPhysics Lesson TitleLessonVideo
5.5.1The Meaning of Power
5.5.2Output and Input Power
5.5.3The Meaning of Efficiency

Whats next?

Enjoy the "Power and Efficiency" physics tutorial? People who liked the "Power and Efficiency" tutorial found the following resources useful:

  1. Physics tutorial Feedback. Helps other - Leave a rating for this tutorial (see below)
  2. Work, Energy and Power Revision Notes: Power and Efficiency. Print the notes so you can revise the key points covered in the physics tutorial for Power and Efficiency
  3. Work, Energy and Power Practice Questions: Power and Efficiency. Test and improve your knowledge of Power and Efficiency with example questins and answers
  4. Check your calculations for Work, Energy and Power questions with our excellent Work, Energy and Power calculators which contain full equations and calculations clearly displayed line by line. See the Work, Energy and Power Calculators by iCalculator™ below.
  5. Continuing learning work, energy and power - read our next physics tutorial: Work and Energy. Types of Energy

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Work, Energy and Power Calculators

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