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ppt (881.15 kB) | 28 pgs | Presentation length: 30-60 minutes

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Energy of a system is its ability to do work.
The unit of energy in SI system is Joule (or Newton- Meter N-m). This is also the unit of work.
Energy may exist in different forms and may be converted from one form to another but is never created or destroyed. (Matter may also be regarded as a form of energy with E=mC2 as the relation between energy and matter). This conservation of energy is the first law of thermodynamics.

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