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Exam 220-1001 topic 1 question 140 discussion

Actual exam question from CompTIA's 220-1001
Question #: 140
Topic #: 1
[All 220-1001 Questions]

Which of the following requires less current to provide the same amount of power to devices inside a PC?

  • A. 5.5V
  • B. 12V
  • C. 120V
  • D. 220V
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by TechTroll at April 30, 2020, 2:02 a.m.

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dieglhix
Highly Voted 4 years, 8 months ago
Where the hell in the book is this?
upvoted 17 times
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MelvinJohn
Highly Voted 4 years, 8 months ago
[question asks which “requires less current to provide the same amount of power” -- Watts = Volts x Amps] [suppose we have a constant “A” (amps, “current”) = 10, then see below] Not (A) 5.5 * 10 = 50.5 watts of power Not (B) 12 * 10 = 120 watts of power Not (C) 120 + 10 = 1200 watts of power D – 220V -- 220 * 10 = 2200 watts of power [so you could reduce the current by half and still get the same power]
upvoted 8 times
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NewpMej
Most Recent 1 year, 4 months ago
My first thought was C, 12V. and when I asked further, I got an explanation that selected B as the answer. 12V, Commonly used in PCs for various components such as fans, hard drives, and peripherals.
upvoted 1 times
NewpMej
1 year, 4 months ago
* first thought was B, 12V
upvoted 1 times
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Students
3 years, 1 month ago
At a higher voltage, less current is necessary w = V * A. Electric consumption (W)
upvoted 3 times
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ElPato80
3 years, 3 months ago
A and B is too little voltage to power all internal "devices". C is enough but can't power less voltage. D can provide more Volts than C AND match 120v if it needs to. ANS = D.
upvoted 1 times
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Bluebery
3 years, 11 months ago
There is no 220V inside a PC. AC 110/220V are outside voltages from the power grid, depending on the country. Inside PC are only DC +3.3V, -+5V, -+12V
upvoted 4 times
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travis40
4 years, 7 months ago
I did not know there was 220 volts INSIDE a PC? Are there PC fans that run on 220v? Is this a special video card that runs on 220V?
upvoted 5 times
user54321
4 years ago
This is the key phrase here "to devices INSIDE a PC". 220v provides power to the PSU. the 5v and 12v rails provide power to devices inside the PC. Out of the 2 the 12V rail needs less current (amps) to provide the pame power output (Watts). 220V gives the MOST power of the options given but just try hooking internal components up to a 220V source and see what it smells like
upvoted 6 times
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firebird21
4 years, 10 months ago
Power=voltage x current
upvoted 2 times
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EmmaW
5 years ago
To devices INSIDE the PC. So I was concerned, maybe INSIDE the PC is 12V? Not 220V for PSU?
upvoted 4 times
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C (25%)
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