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  4. The first law of thermodynamics is represented by the equation :

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Q. The first law of thermodynamics is represented by the equation :

AFMCAFMC 2000

Solution:

According to first law of thermodynamics "Energy can neither be created nor be destroyed, it can only be converted from one form to another"
Mathematically
$\Delta E$ or $\Delta U=q+W$
$\Delta U=$ change in internal energy
$q=$ heat absorbed
$W=$ work done
Heat absorbed by the system $\rightarrow q=+$ ve
Heat given out by the system $\rightarrow q=-$ ve
Work done on the system $\rightarrow W=+$ ve
Word done by the system $W=-$ ve