Millwright Level 1 Practice Exam

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How does alternating current (AC) behavior differ from direct current (DC)?

It flows in a single direction
It alternates direction during its cycle
It is always positive voltage
It has only positive values

The correct answer is: It alternates direction during its cycle

Alternating current (AC) behavior is characterized by its ability to change direction periodically. This means that, during its cycle, AC flows in one direction for a certain period of time and then reverses direction, creating oscillations in voltage levels and direction of current flow. This alternating property is what distinguishes AC from direct current (DC), which flows consistently in a single direction. In practical applications, this alternating behavior allows for the efficient transmission of electricity over long distances and enables the use of various devices that can operate on this type of current. AC systems typically exhibit a sine wave pattern, demonstrating this periodic change in direction. In contrast, direct current (DC) maintains a constant flow of electric charge in one direction with a fixed polarity. Therefore, AC's alternating nature is fundamental to understanding how it functions compared to DC, which is more straightforward in its behavior.