> > Hello.. Just saw that zero ohm resistors are available from Royal Ohm in
> > .125 and .25W varieties..
> >
> > but.. WHY?
>
>      They are probably used as a replacement for jumpers. It's much easier
> for a machine to place a resistor that just happens to be zero ohms than it
> is to place a small wire. Just my guess. TTYL

One very useful function is to re-configure a PCB layout for a
variety of similar functions.  I'm working on a project right now
where the same PCB will be used in three different end
products.  Jumpers are inserted (or not) to configure the PCB
for each model.