define energy equation

There are several equations for different forms of energy...

There's the famous energy mass relationship equation, E=mc^2, and other ones that you may know potential energy, heat energy, kinetic energy, etc.

Now, which one you are referring to, I don't know.

Unknown is absolutely right, there are a lot of energy equations, please be specific.

Isn't it amazing how some will post a query this vague and then never return again to elaborate or respond at all in any manner?

They do not really need help at all.

Google is there for that matter.