What does AC and DC stand for in the electrical field?

Question

What is the name given to the silent electrical discharge between the atmosphere and, for example, trees, ships' masts, steeples and flagpoles?

Answer 1

The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.