In electrical terms, what does 'AC' stand for?

'AC' stands for Alternating Current, which is a type of electrical current that periodically reverses direction, in contrast to direct current (DC), which flows in a single direction. Alternating Current is the standard form of electrical power delivery for residential and commercial power systems due to its efficiency in transmitting electricity over long distances.

The concept of alternating current was developed to enable the distribution of electricity at higher voltages, which minimizes energy loss. This makes it suitable for the power grid that serves millions of homes and businesses. Understanding that 'AC' refers specifically to this form of current is essential, as it lays the foundation for further studies in electrical systems, including discussions around frequency, voltage, and phase relationships, all of which are fundamental to the proper functioning of electrical devices and grids.