Voltages from the PSU

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Hiya peeps

I have a question for you, I am currently in the process of completing my A+ and have been asked a question regarding the voltages from a PSU - now I know that most of this is not in the final exam, but as an inquisitive person its bugging now , so please help me.

The Question is:

Can you match each component with the voltage from the PSU that each one uses?

A. -5V
B. +3.3V
C. 0V
D. +12V
E. +5V
F. -12V

Motherboard
Disk Drives
Serial Port Circuits
ISA Bus Cards
Most Newer CPU's
Ground

Thanks

 

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My selection would be as follows:
-5V ISA Bus Cards
+3.3V 'Most newer CPUs'
0V Ground
+12V Disk Drives
+5V Motherboard
-12V Serial Port

There are a number of problems here, not least the one of 'how old are we talking about here?'!

AFAIK the -5V rail is now optional - almost nothing uses it any longer. Serial ports used both +12 and -12 (see the RS232 spec for why) but serial ports are slowly disappearing, and the -12V can easily be derived with another chip.
The 'most newer CPUs' is a bit of a giveaway as to how old the question is. CPUs have reduced from 3.3 some time ago, and 5V CPUs are now *very* old.

Edit: There is the further problem in that the main voltages are used all over the place - not just on the parts mentioned!

Harry.

 

Thanks for the reply - it makes a little bit more sense now.

Like you said all the voltages are used all over the place. I have a feeling this question was designed for general purposes only (very basic guidelines)

Like I said thanks for getting back to me - much appreciated