The First Law of Thermodynamics is a restatement of the conservation of energy, applied to thermodynamic systems. It says the change in internal energy (ΔU) of a system equals the heat (Q) added to the system minus the work (W) done by the system: ΔU=Q−W.
Using the First Law of Thermodynamics (ΔU=Q−W): ΔU=500J−200J=300J.
Conduction occurs when heat is transferred directly through a material or between materials in physical contact, as a result of collisions between molecules or free electrons.
For an ideal gas at constant pressure, the relationship between temperature and volume is given by Charles's Law: V 1/T 1 = T /2 If 𝑇2=2𝑇1, then 𝑉2=2𝑉1 .
The efficiency of a heat engine is given by: Efficiency= Heat Input/Work Output ×100. Efficiency= 200/500×100=40%.
