Understanding Energy Conservation: Exploring E = E(in) - E(out) + E(generated)

In summary, the conversation discusses the concept of energy conservation and whether or not a specific formula can be used to represent it. The formula in question is E=E_{in}-E_{out}+E_{generated}, which represents the flow of energy into and out of a system, as well as any energy generated within the system. It is noted that this formula is often used in the context of heat conservation. The conversation also references a more comprehensive energy conservation equation presented by Jewett Jr. in an article. It is emphasized that understanding the concept of energy conservation does not require complex mathematics.
  • #1
stanley.st
31
0
Hello,

I nowhere find general form of energy conservation law, but in one book i found this

[tex](*)\hspace{1cm}E=E_{in}-E_{out}+E_{generated}[/tex]

where E(in) is energy flow into system, E(out) is energy flow out of system and E(generated) is energy generated. It was in sense of heat conservation. Can I use this form of heat conservation law? Or is it true, when I say, (*) is energy conservation law?
 
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  • #2
Jewett Jr. has actually presented a somewhat "global energy conservation equation" in Energy and the Confused Student IV: A global approach to energy (Phys. Teach. 46, 210 (2008)). You can access it here: http://dx.doi.org/10.1119/1.2895670
 
  • #3
It is a simple concept, it does not require mathematics to understand. What you wrote up there looks like the energy conservation principle applied to a control volume in some particular case.

If you are just looking for a formula to plug and chug at, you won't find it. Not that it would be useful anyways.
 

What is the energy conservation law?

The energy conservation law, also known as the law of conservation of energy, states that energy cannot be created or destroyed, but can only be converted from one form to another.

Why is the energy conservation law important?

The energy conservation law is important because it is a fundamental law of nature that helps us understand and predict how energy behaves in various systems. It also plays a crucial role in sustainable development and reducing our impact on the environment.

How does the energy conservation law apply to everyday life?

The energy conservation law applies to everyday life in many ways. For example, when we turn on a light, the electrical energy is converted into light and heat energy. When we ride a bicycle, our body's chemical energy is converted into mechanical energy. By understanding this law, we can make more efficient use of energy in our daily activities.

What are some examples of energy conservation in action?

Some examples of energy conservation in action include using energy-efficient light bulbs, insulating buildings to reduce the need for heating and cooling, and using public transportation or carpooling to reduce energy consumption from individual cars.

Is the energy conservation law always true?

Yes, the energy conservation law is always true. However, in some cases, it may seem like energy has been lost or disappeared. This is because energy can be converted into different forms that may not be easily noticeable, such as heat or sound energy.

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