Washington Esthetician State Board Practice Exam

Which appliance typically operates using direct current (DC)?

1. Refrigerator

2. Microwave

3. Flashlight

4. Computer

The correct answer is: Flashlight

The appliance that typically operates using direct current (DC) is a flashlight. Flashlights usually use batteries to power their operation, and these batteries supply direct current. DC flows in a single direction, making it suitable for devices like flashlights that require a steady and constant flow of electricity to function effectively. In contrast, other appliances listed, such as refrigerators and microwaves, operate using alternating current (AC), which flows in both directions and is the standard for household electrical outlets. Computers, while they do contain components that operate on direct current, are plugged into an AC supply and use a power supply that converts this AC to DC for the internal components. Thus, the specific function and typical power supply used in a flashlight make it the clear answer for direct current application.