OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized


3 questions that are bothering me:

I picked up several Pomona dual banana plug shorting bars at the Rickreall,
OR Swap meet 2 weeks ago.

I just noticed they have the usual tab sticking out on one side with the
abbreviation GND on it.

Does Pomona know something about shorting bars that I don't?

Was I using them wrong half of the time if I wasn't paying attention to
their orientation?

Does anyone pay attention to the polarity of a shorting bar?

Another thing: According to Mouser the Yaego 0 ohm resistors they sell are
specified at only 1%. How do they know?

Finally: Why are the buttons on the cash machine at the drive up window of a
bank in Braille?

Dennis Tillman W7PF

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