How are united of energy measured?

Question

For instance, in the theory of relativity where E=mc2, How is E measured. Let's say mc2 = 10 (just a made up number here). That would be 10 what? I can't just say 10 units of energy.

I'm a noob in Physics, so forgive me if this is a dumb question.

Answer 1

Do not worry about your question. Believe me that you can find really absurd questions outhere.

In International System unit of energy is Joule

In c.g.s. the unit will be erg

Another unit is for extremely low energies: electron-volt (eV)

Good luck!

Answer 2

Joules