The physical property of matter carried by particles like protons and electrons that causes it to experience a force in an electromagnetic field; the quantity or amount of static electricity carried by an object, typically measured in coulombs.

(physics/electronics) The interaction between two or more systems or circuits that allows energy to transfer from one to the other; to be coupled.

an element or component part of a machine or instrument; a basic part made of multiple pieces that can be swapped or replaced in similar devices