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-12V and -5v are used where?
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-12V and -5v are used where?

MunMun Member
edited May 2013 in General

Where is negative 12v and negative 5 volt used in computers?

Comments

  • joepie91joepie91 Member, Patron Provider

    It's used to power the reverse flux capacitors when your reactor core overheats.

  • AndreAndre Member

    @joepie91 said: It's used to power the reverse flux capacitors when your reactor core overheats

    I can confirm that this is correct.

  • 24khost24khost Member

    Plus it runs the coffee pot

  • KrisKris Member

    @Mun said: Where is negative 12v and negative 5 volt used in computers?

    Negative?

    12V DC is used for system components, i.e: hard drive, motherboard

    5V DC is USB 1.0/2.0 voltage.

  • MunMun Member

    image

    negative :)

  • Dragoon0309Dragoon0309 Member
    edited May 2013

    It's probably the polarity. Negative and positive poles. Like a car battery the red or black wire, or the + and - of a battery.

  • KrisKris Member

    I was going to say negative ground, but by your screenshot, + is the feed, and - is what's being fed.

    Not negative voltage as much as currently utilized voltage.

    +5V to is getting 5.05V properly. 2.09V is being used.

    +12V is being fed 11.97V, of which 10.80V are being used.

  • MunMun Member

    As per wiki: The −12 V rail was used primarily to provide the negative supply voltage to the RS-232 serial ports. A -5 rail was provided for peripherals on the ISA bus, but was not used by the motherboard.

    http://en.wikipedia.org/wiki/Power_supply_unit_(computer)

    But, I don't fully understand the modern use.

  • DamianDamian Member
    edited May 2013

    @Mun said: But, I don't fully understand the modern use.

    The ATX standard was developed when motherboards came with RS-232 ports and ISA busses, so it's still a hold-over from those days.

    http://en.wikipedia.org/wiki/ATX

    Tom's Hardware used to enjoy writing that the "ATX standard is outdated and obsolete" without ever giving a reason, and this was in ~2003. Haven't been to their site in ages, so uncertain if they still spew basura.

  • MunMun Member

    The reason I am asking is I have a friend that keeps having her comp "die" and then be able to reboot a few minutes later, and In that past seeing voltages that low would signal a bad PSU.

  • ground. black wires. hardly see -5 mostly use in comm. port such as usb. db9 db15 db21/25 rs232 mostly use a comb or -5/-12

  • trewqtrewq Administrator, Patron Provider

    @Mun said: The reason I am asking is I have a friend that keeps having her comp "die" and then be able to reboot a few minutes later

    Sounds like overheating to me...

  • DStroutDStrout Member

    @joepie91 said: It's used to power the reverse flux capacitors when your reactor core overheats.

    But don't leave them running too long. Such powerful cooling components do pose a risk of ice age initiation.

  • happelhappel Member

    @Mun said: But, I don't fully understand the modern use.

    They're not in use on modern computers.

  • AnthonySmithAnthonySmith Member, Patron Provider

    This thread is literally so boring I am going to go outside and ignore the internet for the rest of the day.

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