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3. The Conservation of Energy

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About this Lecture


In this mini-lecture, we introduce the concept of the conservation of energy. In particular, we consider: (i) the definition of the conservation of energy; (ii) two examples of how to use the conservation of energy to solve problems; and (iii) two examples involving the work done on a system, where we see that the change in gravitational potential energy of a system is equal to the work done.


In this course, Professor Douglas Halliday (Durham University) explores energy. In the first mini-lecture, we discuss the big picture of energy, looking at types of energy, key principles, and units. In the second mini-lecture, we consider changes in energy by looking at examples of various energy exchanges involving kinetic and potential energy, heat, electrical energy, etc. The third mini-lecture introduces the concept of the conservation of energy and works through four related examples. In the fourth mini-lecture, we discuss the concept of work in greater detail and go through a couple of examples. In the fifth mini-lecture, we introduce the concepts of power and efficiency, working through some examples and looking at how to improve the efficiency of a system.


Douglas Halliday is a Professor of Physics at Durham University and a Director at the Durham Energy Institute. His research involves next-generation thin-film photovoltaic (solar) devices. Professor Halliday is also the Director of the Centres for Doctoral Training in Energy and Global Challenges Research as well as the Chair of the European Universities Association Energy and Environment Platform (EUA-EPUE).

Cite this Lecture

APA style

Halliday, D. (2022, January 14). Energy - The Conservation of Energy [Video]. MASSOLIT.

MLA style

Halliday, Douglas. "Energy – The Conservation of Energy." MASSOLIT, uploaded by MASSOLIT, 14 Jan 2022,

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