TestOut LabSim A+ Certification Practice Exam

Which device can store large amounts of electricity even when unplugged?

1. Flat-screen Monitor.

2. CRT Monitor.

3. Power supply unit.

4. External hard drive.

The correct answer is: CRT Monitor.

A CRT (Cathode Ray Tube) Monitor is indeed a device that can store large amounts of electricity, specifically in its capacitors, even when unplugged. CRT monitors contain high voltage components that can retain electrical charges long after being disconnected from power sources, due to the design of their circuit boards and internal components. This ability to store charge can pose safety hazards, which is why technicians are advised to discharge CRTs before servicing them to avoid electric shock. While other devices, such as power supply units, have capacitors and can store electricity briefly, they don't retain significant charge when unplugged, as their function is to convert and supply power rather than to hold it. Flat-screen monitors and external hard drives, primarily designed for display and data storage, respectively, don’t have the same capacity for storing significant amounts of electricity when disconnected from power.