220-801 · Question #916
A technician is giving a safety class to new employees. Which of the following contains potentially dangerous voltages and should be handled with care, even if the power has been recently…
The correct answer is D. CRT monitor. CRT (Cathode Ray Tube) monitors contain a flyback transformer and high-voltage capacitors that can store charges of 25,000 volts or more. These capacitors can retain a lethal charge for hours, days, or even weeks after the unit has been unplugged. This makes CRTs uniquely…
Question
A technician is giving a safety class to new employees. Which of the following contains potentially dangerous voltages and should be handled with care, even if the power has been recently disconnected?
Options
- ALaser printer
- BWireless router
- CPaper shredder
- DCRT monitor
How the community answered
(33 responses)- A3% (1)
- B3% (1)
- D94% (31)
Explanation
CRT (Cathode Ray Tube) monitors contain a flyback transformer and high-voltage capacitors that can store charges of 25,000 volts or more. These capacitors can retain a lethal charge for hours, days, or even weeks after the unit has been unplugged. This makes CRTs uniquely dangerous among consumer electronics - simply disconnecting power does not make them safe to handle internally. Laser printers (A) do contain high voltage for the drum charging process and a hot fuser assembly, but their stored charge dissipates relatively quickly after power-off. Wireless routers (B) operate on low voltages (typically 12V or less) and pose no significant shock hazard. Paper shredders (C) have a mechanical motor but no significant energy storage. CRT monitors are the classic safety example taught in IT certifications for this exact reason.
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