Q = dE + w is the equation of
A. First law of thermodynamics
B. Second law of thermodynamics
C. Zeroth law
D. None of the above
Answer: Option A
Solution (By Examveda Team)
The equation Q = dE + w represents the First law of thermodynamics, which is a statement of the conservation of energy.In this equation:
>> Q represents the heat energy supplied to the system,
>> dE represents the change in internal energy of the system, and
>> w represents the work done by or on the system.
The First law of thermodynamics asserts that energy cannot be created or destroyed, only converted from one form to another.
Key Points:
>> The First law is a statement about energy conservation in thermodynamic processes.
>> Second law of thermodynamics deals with the direction of energy flow and entropy, not the equation Q = dE + w.
>> Zeroth law establishes thermal equilibrium but is not related to this equation.
This Question Belongs to Agriculture >> Agricultural Engineering
Where:
dE: Change in the internal energy of the system.
Q: Heat added to the system (positive if heat is added, negative if heat is removed).
W: Work done by the system on its surroundings (positive if work is done by the system, negative if work is done on the system).