Washington Esthetician State Board Practice Exam

Which form of electrical current is known for flowing alternately in both directions?

1. Direct current

2. Alternating current

3. Static current

4. Dynamic current

The correct answer is: Alternating current

Alternating current is characterized by its ability to flow in both directions, changing its direction periodically. This type of current is commonly used in various electrical applications because it can be easily transformed to different voltages, making it suitable for long-distance transmission. In esthetics, alternating current is often utilized in certain devices and treatments that require the flow of electricity to achieve specific skin benefits, such as improved circulation or enhanced product penetration. Direct current, on the other hand, flows in a single direction and is often used in batteries and smaller electronic devices. Static current refers to an accumulation of electric charge on the surface of objects, which does not flow and is not used in continuous electrical applications. Dynamic current can be a less common term and does not specifically describe a type of electrical flow in the same way that direct and alternating currents do. Therefore, alternating current is the only one among the options that fits the description of flowing alternately in both directions.