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Re: What a great site!

The equation for parallel resistances (and impedances) is thus:

1/R1 + 1/R2 = X, 1/X = Rtotal

I'm no math whiz so forgive if the formula isn't expressed correctly. But for the two impedances you mentioned, 4 & 2:

1/4= 0.25

1/2= 0.5

.25+.5= .75

1/.75= 1.33Ω

For more than two parallel resistances, just keep repeating the 1/X + string for each and then divide 1 by the total.

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