What do AC and DC stand for in the context of electrical supply?

The correct answer is that AC and DC stand for Alternating Current and Direct Current, respectively. This terminology is fundamental in the study of electrical engineering and electronics.

Alternating Current (AC) refers to the flow of electric charge that periodically reverses direction. This type of current is the form of electricity commonly used in household outlets and for powering larger electrical systems like those found in the electrical grid. The ability of AC to easily transform to different voltage levels makes it ideal for long-distance transmission.

Direct Current (DC), in contrast, is the flow of electric charge that only moves in one direction. DC is commonly used in applications where a stable and constant voltage is needed, such as in battery-powered devices and electronic circuits.

Understanding the distinction between these two types of current is crucial for anyone working in electrical fields, as it affects how power systems are designed and utilized in various applications.