question_answer

When is the heat supplied to a system equal to the increase in its internal energy?

Answer:

                According to the first law of thermo- dynamics, \[\Delta Q=\Delta U+P\Delta V\]. If the heat is supplied in such a manner that the volume does not change (for isochoric change, \[\Delta V=0\]). Then whole of the heat energy supplied to the system will increase internal energy only.