PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Off-Topic Discussion (http://www.peachparts.com/shopforum/off-topic-discussion/)
-   -   Electrical engineering question... (http://www.peachparts.com/shopforum/off-topic-discussion/230472-electrical-engineering-question.html)

KarTek 08-15-2008 08:09 AM
Electrical engineering question...
 
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

:confused:

Botnst 08-15-2008 08:14 AM
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.

Kuan 08-15-2008 08:19 AM
(r1*r2*r3*r4*r5)/(r1+r2+r3+r4+r5)

KarTek 08-15-2008 08:48 AM
Great, thanks!

OldPokey 08-15-2008 01:33 PM
Quote:
Originally Posted by Botnst (Post 1939463)
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.
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.

Botnst 08-15-2008 01:38 PM
Quote:
Originally Posted by OldPokey (Post 1939730)
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.
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?


All times are GMT -4. The time now is 11:53 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website