What is the fundamental principle of alternating current (AC)?

What is the fundamental principle of alternating current (AC)?

• A. It flows in one direction only
• B. It is a current that periodically reverses direction
• C. It is constant and does not vary
• D. It flows only at high voltage

Answer: (B)

The fundamental principle of alternating current (AC) is that it is a current that periodically reverses direction. Unlike direct current (DC), which flows steadily in one direction, AC changes its direction and magnitude over time in a sinusoidal pattern. This characteristic allows AC to be easily transformed to different voltages, making it more suitable for long-distance transmission of electricity. As a result, AC is the primary form of electrical power supplied to homes and businesses. The nature of AC is essential for understanding how it is used in various applications, from powering household appliances to operating industrial machines. It enables efficient energy distribution and is integral to the functionality of many electrical systems.

The fundamental principle of alternating current (AC) is that it is a current that periodically reverses direction. Unlike direct current (DC), which flows steadily in one direction, AC changes its direction and magnitude over time in a sinusoidal pattern. This characteristic allows AC to be easily transformed to different voltages, making it more suitable for long-distance transmission of electricity. As a result, AC is the primary form of electrical power supplied to homes and businesses.

The nature of AC is essential for understanding how it is used in various applications, from powering household appliances to operating industrial machines. It enables efficient energy distribution and is integral to the functionality of many electrical systems.