First law of thermodynamics explanation with formula

First law of Thermodynamics

The fixed amount of energy in a isolated system can not lose or gain,but the energy can change its type into other type of energy.

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As you can see electrical energy is transferring from electric board to, fan and now electrical energy is converted into mechanical energy, that's how, energy can not lose or gain but transferring in other type of energy. You can check these examples to make it easy...

Examples

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Formula:

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Thanks for reading!