Colorado Esthetician Written Practice Exam

Direct current is characterized by which of the following descriptions?

1. Constant, even flowing current that travels in one direction only

2. Flowing in one direction then in the opposite direction

3. High resistance to electric flow

4. Use for measuring the pressure or force of electrons

The correct answer is: Constant, even flowing current that travels in one direction only

Direct current is characterized by a constant, even flowing current that travels in one direction only. This type of current is found in batteries, fuel cells, and solar cells. It is important to know this definition as an esthetician so that you can safely and effectively use devices that utilize direct current in your professional practice. Option B is incorrect because that description is more indicative of alternating current, where the flow of electrons changes direction periodically. Option C is incorrect because direct current typically has lower resistance to electric flow compared to alternating current. Option D is incorrect because the use for measuring the pressure or force of electrons is typically associated with voltage, not the type of current.