system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does leakage current work and is it always there?

Please explain it to me in simple terms. 

My stepfather always gets pissed at me cuz I don't to pull every plug from the wall and every battery out of tools whenever they are not used.

Just because some idiot told him a year ago that apparently there is "leakage current" running through everything at all times.

It just stresses me out, im very certain that this dude is wrong but maybe so am I, I need to understand how this actually works to reasonably judge. Thanks guys.
gpt
Oh yeah most stuff uses a miniscule amount of power when idling. However it amounts to so little that you lose more money on wear and tear on the plugs from all the yanking.

Oh and batteries self discharge just by existing so good luck on that front.