Application of First Law of Thermodynamics on Different Process - I

we have the different process like:

• Cyclic process
• Isolated process
• Isothermal process
• Isobaric process
• Isochoric process
• Adiabatic process

Cyclic process:-

When a system is taken form an initial state to other state and finally brought back to the initial state, then it is called “Cyclic Process”.

We know that internal energy is a function of state of system

So there will be no change in the internal energy

=> ΔV = 0

We know that

ΔV = Q – W

=>Q – W = 0

Q = W

So we can conclude that for a cyclic process total heat energy given will be converted to work.

Isolated system:-

A system which can neither do work nor can take or give heat from or to the outside is called an isolate system for such process Q = W = 0.

ΔV = Q – W

=>ΔV = 0; change in internal energy = 0

Isochoric process:-

The process which takes place at constant volume is called isochoric process.

For an isochoric process ΔV = 0

We know that

W = pΔV = P (0) = 0

W = 0

ΔV = Q – W

ΔV = Q

So for isochoric process heat energy is completely converted to change in internal energy.