It states that energy can neither be created nor destroyed although it can be converted from one form into another.
If a closed system having E1 internal energy is supplied ‘q’ amount of heat, then internal energy of the system becomes (E1 + q)
If work (w) is done on the system, then its internal energy further increases and becomes E2.
Thus E2 = E1 + q + w
E2 – E1 = q + w
DE = q + w
In case q is the heat absorbed and w is the work done by the system then,
DE = q + (– w)
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