How can electricity be charged?

Answer 1

Charge is never created or destroyed. What we call "charging" an object, or

discharging it, or collecting charge, is really just moving around some charge

that was there all the time.

Any material normally has equal amounts of positive and negative charges in

the atoms that comprise it. In some materials, the electrons are rather loosely

bound to their atoms, and some of them can be "stripped off" and moved to

somewhere else. (That's what you do when you rub a balloon against a wool

sweater, or scuff your shoes across the carpet.)

Electrons carry negative electric charge. When electrons are moved to another

place, then one place has more electrons than it should and appears negatively

charged, and the other place has fewer than it should and appears positively charged.