Is energy constant?

Question

If energy can neither be created nor destroyed, does that imply that there is a set amount of total energy despite its form?

Answer 1

to put it simply: yes.

Conservation of energy states that the total amount of energy (including potential energy) in a closed system remains constant. In other words, energy can be converted from one form to another, but it cannot be created or destroyed. In modern physics, all forms of energy exhibit mass and all mass is a form of energy.

The energy conservation law is possibly the most important, and certainly the most practically useful, of several conservation laws in physics. The main reason is that energy, as defined via mechanical work, is force times distance, and civilization needs to exchange by goods and build various structures and machines - both required to transport matter over distance against dissipating forces (friction, air or other medium resistance, etc).

In thermodynamics, the first law of thermodynamics is a statement of the conservation of energy for thermodynamic systems.

The energy conservation law is a mathematical consequence of shift symmetry of time. It is connected with the fact that physical laws remain the same over time.

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The first law of thermodynamics, a generalized expression of the law of the conservation of energy, states:

The increase in the internal energy of a system is equal to the total amount of energy added to the system by heating, plus the amount added in the form of work done on the system.

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Answer 2

Yes for sure.

Energy is constant. Here's the definition of energy.
"Energy can neither be created nor be destroyed. I can change from one form to another but the total energy in the universe remains constant."

For eg.,The electrical energy is converted into heat energy in our iron box. and many more examples.

For more details see this site :
http://en.wikipedia.org/wiki/Energy

Hope you understood the concept.

Answer 3

Yes, energy constantly changes forms. Mechanical energy can be used in a generator to create electrical energy, to power a light bulb to create light and heat energy, which spread out evenly unless obstructed by another object.

Answer 4

Yes, energy and all forms of it including mass in the universe is constant. (mass according to Einstein's E = MC^2 is a form of energy).

Answer 5

Yes

Answer 6

No, it is not in general.
When I work, my energy goes down. I can increase my energy by eating.
When I accelerate my car, its kinetic energy grows; the chemical energy in the tank goes down.
Energy is created during annihilisation of matter and anti matter.(mass is vanishing according E = mc2)
There is conservation of total energy in a closed system.

Th

Answer 7

Yes.

Answer 8

Yes it does.

Answer 9

duh