Home / Formulas / Physics Formulas

Law of Conservation of Energy

According to the law of conservation of energy, the total energy of an isolated system remains conserved over time. In this definition, the isolated system refers to as a thermodynamic system so designed that no matter or energy can pass through it.    

Conservation of Energy Formula

Energy spent in one act = Energy gained in the related act

For a given system, we can write,

\begin{array}{l}E_{in}\;-\;E_{out}=\Delta E_{sys}\end{array}

As we know, the net amount of energy transfer into or out of any system occurs in the form of heat (Q), mass (m) and work (W). Hence, we can rewrite the aforementioned equation as:

\begin{array}{l}E_{in}\;-\;E_{out}=Q\;-\;W\end{array}

Upon dividing all the terms into both sides of the equation by the mass of the system, the equation represents the law of conservation of energy on a unit mass basis, as shown below:

\begin{array}{l}Q\;-\;W=\Delta u\end{array}

Thus, we can write the conservation of energy rate equation as:

\begin{array}{l}Q\;-\;W=\frac{dU}{dt}\end{array}

Related Topic :
Chemistry Formulas ListMaths Formulas List
What is LibreOffice? LibreOffice Impress Features ?LibreOffice Impress CCC Questions and Answer in Hindi 2022
CCC LibreOffice Calc Paper Questions with AnswersCCC NIELIT Quiz 2022
Interview Questions and Answers for ExperienceInterview Questions and Answers for Freshers
MCQ 
[social_share_button themes='theme1']

Leave a Comment