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Hi, I would be very grateful if anyone could shed some light on the below diagram as I'm trying to calculate the total resistance between A and B in this series parallel configuration.

10 and 20 are in parallel and 90, 70, and 80 are also in parallel but then I get confused with it as it then looks like two series circuits connected in parallel between A and B when you re-draw the diagram???

Thanks.

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    \$\begingroup\$ 90, 70, and 80 are not in parallel. 70 and 80 in parallel are in series with 60 which is all parallel with 90. \$\endgroup\$ – Samuel Nov 1 '13 at 19:29
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  1. Re-draw your diagram

schematic

simulate this circuit – Schematic created using CircuitLab

If you can prove to yourself why these two circuits are equivalent, it should become apparent what is in parallel and what is in series.

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Break the problem down so that eventually you end up with two parallel ( // ) resistance which will then give you the impedance between A &B.

LEFT of a --> b

X = 10//20 + 30 + 40

RIGHT

Y = (( 70//80 + 60 ) // 90 ) + 50

The: X // Y

This looks like homework though, so I shall leave it there ;)

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  • \$\begingroup\$ Hi , Thanks to everyone for the great help as it can get somewhat frustrating at times but I have a much better understanding of it now. Cheers \$\endgroup\$ – john brendan Nov 1 '13 at 21:26

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