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Car Forum / Driving, Maintenance, Tuning / Car Audio / January 2007

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parallel Circuit...

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jimbo_limited - 23 Jan 2007 17:08 GMT
What i have now is an presentation about parallel circuits.  Now I'v
found few things about it... is ther ean equation for the paralle
circuit... like two 4 ohm spkrs in parallel makes 2 Ohm...  About th
Current of the parallel circuit.  How voltage always the same...

Just need alot of information about it..

--
jimbo_limited
KU40 - 23 Jan 2007 20:39 GMT
for parallel the equation is:  impedence of one load/total number of
loads.  (e.g.- one SVC sub equals one load, one DVC sub equals 2
loads).

For voltage.....yes it stays the same.  Current is divided equally
among each load.

Not sure what else you are asking for.

Signature

KU40

Mariachi - 23 Jan 2007 21:11 GMT
In parallel circuits you have the same voltage going through each
parallel section.
For resistances in parallel you have this equation:

1/R(total) = 1/R1 + 1/R2 + ... 1/R(n)
n = number of resistances in parallel

So if you have a 4 ohm speaker in a parallel circuit with another 4 ohm
speaker you have this equation.
R1 = 4 Ohm
R2 = 4 Ohm
1/R(total) = 1/4(ohm) + 1/4(ohm)
1/R(total) = 1/2 (ohm)
R(total) = 2 Ohm

Ohms law  V = IR
I - current
R - resistance
V - voltage

Resistances in series
R(total) = R1 + R2 + ... R(n)

Current on the other hand is not the same in a parallel circuit, it is
ONLY the same when all the resistances in the parallel circuit are
equal.

Voltage in series is V(total) = V1 + V2 + V3 + ... V(n)
Current in Parallel is i(total) = i1 + i2 + i3 + ... V(n)
Current in series is the same throughout the series circuit
Voltage is not the same throughout a series circuit

Then you have power:

P = Voltage * current
or
P = I^2 * R
or
P = (V^2)/R

Capacitance is measured in farads.  1 Farad = 1 Volt * 1 Coulomb
1 Coulomb = 6.25 * 10^28 electrons

Voltage = U / q [Joules per Coulomb

The discharge of a capacitor is:  V(c) = V(initial) * e^(-t/RC)
time constant = RC
Time constant is the time it takes for the capacitor to reach 37 % of
it's original value.
so when t = time constant you have this
V(c) = V(initial)*e^(-1)
If V(initial) = 1, then V(c) = .37

Inductors I didn't mention... if you have any question just ask

> What i have now is an presentation about parallel circuits.  Now I've
> found few things about it... is ther ean equation for the parallel
> circuit... like two 4 ohm spkrs in parallel makes 2 Ohm...  About the
> Current of the parallel circuit.  How voltage always the same...
>
> Just need alot of information about it...
Mariachi - 23 Jan 2007 21:14 GMT
> Capacitance is measured in farads.  1 Farad = 1 Volt * 1 Coulomb
> 1 Coulomb = 6.25 * 10^28 electrons

Sorry, 1 Farad = 1 Coulomb per Volt
D.Kreft - 23 Jan 2007 23:34 GMT
On Jan 23, 9:08 am, jimbo_limited

> What i have now is an presentation about parallel circuits.  Now I've
> found few things about it... is ther ean equation for the parallel
> circuit... like two 4 ohm spkrs in parallel makes 2 Ohm...  About the
> Current of the parallel circuit.  How voltage always the same...
>
> Just need alot of information about it...

You know, aside from Google being your friend (this kind of information
is *really* easy to find), so is Wikipedia, especially when you need
"alot of information":

   http://en.wikipedia.org/wiki/Ohm%27s_law

You'd be amazed at how much information is at your fingertips, if you
only use the tools available to you.

-dan
GregS - 24 Jan 2007 13:12 GMT
>On Jan 23, 9:08 am, jimbo_limited
>
[quoted text clipped - 13 lines]
>You'd be amazed at how much information is at your fingertips, if you
>only use the tools available to you.

Don't forget...............

http://www.educypedia.be/index.htm
Matt Ion - 24 Jan 2007 07:03 GMT
> What i have now is an presentation about parallel circuits.  Now I've
> found few things about it... is ther ean equation for the parallel
> circuit... like two 4 ohm spkrs in parallel makes 2 Ohm...  About the
> Current of the parallel circuit.  How voltage always the same...
>
> Just need alot of information about it...

Start here: http://www.bcae1.com/

Bookmark it - you'll use it often.
 
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