OK, this is driving me nuts... Back in HS I learned this formula but it escapes me and I can't seem to find a reference in a Googe search, etc...

What is the formula for determining resistance in a parallel circuit? I can figure out arrays that have all of the same value resistors (like speakers) in my head but what about say, 5 various values?

320 ohm
1k ohm
240 ohm
1M ohm
500K ohm

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

resiststance = 1/(1/320 ohm +1/1k ohm +1/240 ohm+1/1M ohm + 1/500k ohm)

For DC circuit.

AC circuits I don't recall other than there was a difference.

(r1*r2*r3*r4*r5)/(r1+r2+r3+r4+r5)

__________________
You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman

Great, thanks!

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

For a purely resistive circuit, there is no difference between AC and DC. Once you start adding in capacitance and inductance you get reactance - and that varies with the frequency of AC source.

__________________
1984 300TD

Oh yeah. Now I remember ... sort of.

Signal over wires to a speaker will vary over time in both amplitude and frequency. So you get those AC critters?