What type of current is primarily delivered to homes and businesses?

The type of current primarily delivered to homes and businesses is alternating current (AC). AC is characterized by the flow of electric charge that periodically reverses direction, which allows for efficient transmission over long distances. This is crucial for utility companies because it minimizes energy loss during transmission.

One key advantage of AC is the ability to easily transform voltage levels using transformers, making it practical to transmit electricity at high voltages and then step it down to safer, usable levels for residential and commercial use, typically at 120 or 240 volts.

In contrast, direct current (DC) flows in a single direction and is commonly used in battery-powered devices but is less efficient for long-distance transmission. High frequency current is used in specialized applications such as RF (radio frequency) transmissions but not for general electrical service. Variable current refers to changes in current flow that may occur in some specific applications but does not represent the standard delivery method for homes and businesses.