This document discusses electric current, charge, and potential difference. It defines current as the flow of charge carriers when a complete circuit exists and there is a potential difference created by a power source. Electrons are the charge carriers that flow through metals. Current is measured in Amperes (A) and symbolized as I. Charge is measured in Coulombs (C) and symbolized as Q. The relationship between current, charge, and time is defined by the formula ΔQ = IΔt, which calculates the change in charge as the current multiplied by the change in time. Several examples are provided to demonstrate calculating charge using this formula.