Red Seal Industrial Electrician Practice Exam

Alternating Current (AC) is characterized by its periodic change in direction, which is a fundamental distinction from Direct Current (DC), where the flow of electric charge is unidirectional and constant. This means that in an AC circuit, the voltage alternates, typically in a sinusoidal waveform, allowing for the current to flow first in one direction and then reverse, creating an oscillating effect.

The periodic change in the direction of AC makes it suitable for applications such as electrical grids, where it can be easily transformed to different voltages for efficient transmission over long distances. AC also has the ability to power various types of motors and devices designed to operate with alternating supply.

In contrast, DC is commonly used in situations requiring a stable and consistent voltage, such as in batteries and electronic devices, where a steady flow of current is necessary for proper function. Recognizing this difference is crucial for understanding their applications and characteristics in electrical systems.