Which of the following is MOST likely to contain hazardous voltages?

The correct answer is D. CRT display. CRT (Cathode Ray Tube) displays use a flyback transformer to accelerate electrons toward the phosphor screen, generating voltages typically ranging from 15,000 to 30,000 volts (15–30 kV). Critically, the internal capacitors can retain these lethal charge levels for hours or…

Hardware

Question

Options

ACD-ROM drive
BExternal USB drive
CInkjet printer
DCRT display

How the community answered

(31 responses)

A
3% (1)
C
3% (1)
D
94% (29)

Explanation

CRT (Cathode Ray Tube) displays use a flyback transformer to accelerate electrons toward the phosphor screen, generating voltages typically ranging from 15,000 to 30,000 volts (15–30 kV). Critically, the internal capacitors can retain these lethal charge levels for hours or even days after the unit has been powered off and unplugged. This makes CRTs one of the most dangerous components a technician can encounter - opening the case without proper discharge procedures can result in electrocution. CD-ROM drives, external USB drives, and inkjet printers operate at low, safe voltages (typically 5V or 12V) and pose no comparable high-voltage hazard.

Topics

#CRT display#hazardous voltage#electrical safety#display technology

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