220-801 · Question #913
Which of the following devices requires 12V of power from the power supply?
The correct answer is B. CD-ROM Drive. Mechanical drives such as CD-ROM drives use both 5V (for logic/electronics) and 12V (for the motor that spins the disc and moves the laser assembly) from the power supply via a standard Molex connector. The 12V rail is specifically used to power motors and drive mechanisms in…
Question
Which of the following devices requires 12V of power from the power supply?
Options
- ASerial Port Card
- BCD-ROM Drive
- CParallel Port
- DAudio Jack
How the community answered
(40 responses)- A5% (2)
- B93% (37)
- C3% (1)
Explanation
Mechanical drives such as CD-ROM drives use both 5V (for logic/electronics) and 12V (for the motor that spins the disc and moves the laser assembly) from the power supply via a standard Molex connector. The 12V rail is specifically used to power motors and drive mechanisms in storage devices. Serial Port Cards (A) and Parallel Ports (C) are interface components that draw minimal power from the 3.3V or 5V rails via the motherboard's PCI slot. An Audio Jack (D) is a passive connector on the motherboard or sound card and draws no meaningful independent power from the PSU. Optical and mechanical drives are the classic example of 12V consumers in a PC.
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