What is the term for electric current that continually changes direction?

What is the term for electric current that continually changes direction?

• A. Direct current
• B. Alternating current
• C. Static current
• D. Residual current

Answer: (B)

The correct term for electric current that continually changes direction is "alternating current." This type of current is characterized by its periodic reversal in flow due to the changing voltage over time. Alternating current is commonly used in household and industrial power systems because it can be easily transformed to different voltages, making it suitable for long-distance transmission.

In contrast, direct current flows in a single direction and does not change its polarity, making it suitable for battery-operated devices. Static current refers to an accumulation of electric charge on an object, which does not involve a continuous flow of current. Residual current typically pertains to the current that remains after some processes but is not a standard term for describing the directional flow of electric current.