Power and Efficiency |
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Video Lecture 45 of 83
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### Lecture Description

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The objectives of this video tutorial are to introduce the concept of power & efficiency followed by completing an exemplary problem using the knowledge of power concepts. At first, the video gives definition of power stating that power is the amount of work performed per unit of time which unit is watt as per international standard. Next, the video presents a problem asking to determine power outputs when it takes a person 8 minutes to push a car 300 m to a mechanic due to breakdown. The constant force exerted by the person during the pushing time is also given as 150 N.

Moving on, the video step by step shows how to assess required values to calculate down the work outputs of the person elaborating all the facts & figures in details. Later, the video briefly discusses on efficiency which is the ratio of useful output power to the input power & successively illustrates the formula of calculating mechanical efficiency. One important note should be keep in mind that efficiency is always less than one due to the influence of frictional forces which dissipates energy.

### Course Description

Mechanics, the study of forces and physical bodies, underpins a very large proportion of all forms of engineering. A thorough understanding of mechanics is essential to any successful engineer. This course helps develop an understanding of the nature of forces with consideration for how they may be simplified in an engineering context. The conditions of equilibrium are then used to solve a number of problems in 2D and 3D before moving on to a broad range of topics including centroids, distributed loads, friction and virtual work. The course will also provide an introduction to dynamics, with a particular focus on the effects that forces have upon motion.