0 Ohm resistance

Discussion in 'General Electronics Chat' started by Iodem_Asakura, Nov 24, 2005.

  1. Iodem_Asakura

    Thread Starter Senior Member

    Sep 14, 2004
    140
    0
    I thought that a 0 ohm resistance was used as a fuse, but i'm begining to doubt about it. Could someone light me up about this? Is it used as a fuse or a jumper? How much current does it support?

    Thanks for your help.
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    You will find that a fuse actually has low resistance, which is not 0Ω. The fuse is designed as the weakest point in the circuit and will blow first if there is a current surge over the rating of the fuse. Up to the fuse rating the fuse mateial acts merely as a resistive element dispating power in the same way as resistor would.

    The only example I know of with (effective) 0Ω resistance are superconductors: Information on Superconductors
     
  3. kurios

    Member

    Sep 29, 2005
    14
    0
    well according to me what i have studied and observed is that the fuse do have some resistance but not equal to 0. bcoz i it have 0 resistance then why not we use the direct wire instead of using fuse.... just think over it

    secondly, the fus has some resistance but that resistance is soo much low with respect to the load resistance that it can be said as ≈ 0Ω hence the fuse blows first whenever current than the normal ratio as fuse provides the easiest path (due to it's low resistance)
     
  4. Sebi

    Well-Known Member

    Sep 24, 2005
    59
    0
    The zero ohm "resistor" (marked with one black stripe or on SMD "0") used as jumper. This method simple for automatic assembly.
     
  5. Iodem_Asakura

    Thread Starter Senior Member

    Sep 14, 2004
    140
    0
    Thanks that was what i was talking about, the zero ohm resistor (the one marked with an only stripe of black color). Then the answer is, that it is used as a jumper, eh?

    Do you know how many current does it support? I have only seen it in oine size.
     
  6. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
    69
    The type we use are rated by the manufacturer at:

    25A @ 25'C linearly derated to 0A at 150'C
    (These have a body 7mm long x 2.5mm diameter, lead 0.6mm diameter)

    I think it's basically the rating of the wire they are moulded around..
     
  7. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    I've not come across them before.

    To back up what rjenkins is saying, check here.
     
  8. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi

    here's another info on 0 Ω links

    moz
     
  9. chulomex

    New Member

    Dec 1, 2005
    4
    0
    Zero Ohms are usually used as jumpers. Sometimes there are paths that you may want to add to an already built board and you would really like to have a way to add that part of the circuit later. Then all you do is put a placeholder for the resistor but don't put anything in. When the time comes that you need to add that part of the circuit all you do is install a Zero Ohm resistor and now the other path is working as well.
     
Loading...