Elementalist energy storage

Can someone better explain how energy is used/gained when I cast these two spells? Thanks.

You gain 30% and you gain 50%. Two numbers should float up each time.

Example: You cast a spell that costs 10 energy with either of these enchantments running. Master of Magic gives 3 energy and Elemental Attunement gives 5 energy.

If u sucessfully cast the spell.If interrupted u dont get energy back.Also if u use something like glyph of lesser energy u get energy back based on skill cost not based on what u used to cast.

Simple enough. thanks.