The document discusses the first law of thermodynamics. It states that the first law is based on the principle of conservation of energy, where the net heat supplied to a system equals the net work done by that system. The first law considers the heat, work, and energy involved in reactions. Energy can be transformed from one form to another but can neither be created nor destroyed according to the first law. The document also mentions internal energy and provides references for further reading on thermodynamics and its laws.

1. Thermodynamics - Laws
S.Gunabalan
Associate Professor
Mechanical Engineering Department
Bharathiyar College of Engineering & Technology
Karaikal - 609 609.
e-mail : gunabalans@yahoo.com
1. First law of Thermodynamics

2. First law of Thermodynamics
• The first law of thermodynamics considered the
heat/work/energy involved in reactions,
Definition
– In a thermodynamic Cycle, net heat supplied to the system
is equal to net work done by the system
=
First law of thermodynamics is based on principle of
conservation of energy
Energy is neither created not destroyed, but get
transformed from one form to another.

3. Perpetual Motion Machine – 1
(PMM-1)
ℎ ℎ
ℎ

4. Internal Energy
• Net stored Energy of the system
∆ = −

5. Reference
• Rajput, R. K. 2010. Engineering thermodynamics. Jones and Bartlett
Publishers, Sudbury, Mass.
• Nag, P. K. 2002. Basic and applied thermodynamics. Tata McGraw-Hill, New
Delhi.