I will give an brainlist and a lot of points of who ever does this correctly.

active energy

*Energy associated with something moving or changing in some way

potential energy

potential energy *stored energy that depends upon the relative position of various parts of a system

similarities between active and potential energy

*they can both be converted into each other's form of energy

a:

by the combination of an unlimited number of elements

let that person have a turn to speak : )