Re: total resistance in parallel circuits
- From: "redbelly" <redbelly98@xxxxxxxxx>
- Date: 6 Oct 2005 06:20:48 -0700
Midnight Oil wrote:
> I am new to electronics, and I've been learning the basics of ohm's
> law. I ran into the formula for finding the total resistance in a parallel
> circuit, struggled with it's meaning...and I want to be sure I understand
> the formula:
>
>
> R(tot) = 1
> -------------
> 1 + 1 + 1
> -- -- --
> R1 R2 R3
>
>
> I broke the formula down like this:
>
>
> R(tot) = 1 <--- E (volts)
> ---------------
> 1 + 1 + 1
> -- -- -- <--- I (amps)
> R1 R2 R3
>
>
That's not a bad way to interpret what's going on. But, to make the
units work out properly, we could multiply the expression by 1V/1V
(since that equals 1 and multiplying by 1 is allowed), then manipulate
things like this:
1 1V
R(tot) = ---------------- x ----
1 1 1 1V
-- + -- + --
R1 R2 R3
1V <--- E (volts)
= ----------------
1V 1V 1V
-- + -- + -- <--- I (amps)
R1 R2 R3
So each resistor has 1V across it, and has (1V/Rx) current flowing
through it.
Regards,
Mark
p.s.
>
> The Moon is Waxing Crescent (7% of Full)
Hmmmm. Years ago I had DOS version of that program. Is there
something available for Windows these days?
.
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