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Which resistors are parallel and which are in series ? How can I find the equivalent resistance in such cases ? Is there rule or method for figuring this out ?

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- Thread starter agoogler
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- #1

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Which resistors are parallel and which are in series ? How can I find the equivalent resistance in such cases ? Is there rule or method for figuring this out ?

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Check out Post #5 from our last PF Physics Trivia:

https://www.physicsforums.com/showthread.php?t=680864

Zz.

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Actually this is from a book so I know that these resistors are in parallel but I'm more interested to know why i.e. the explanation.

Check out Post #5 from our last PF Physics Trivia:

https://www.physicsforums.com/showthread.php?t=680864

Zz.

- #4

UltrafastPED

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Serial means that they are all spliced into a single wire, end to end, with nothing else connected in the middle.

If you can topologically rearrange a set of resistors so that they could all be soldered together at one end, and also at the other, then they form a parallel resistance.

- #5

UltrafastPED

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If you end up with resistors strung along a single line with each node connecting only the next resistor, then this branch is serial.

If instead you end up with two wires such that you could shorten each of the wires into a "solder knot", and end up with one end of each resistor in one of the solder knots, and the other end of each one in the second solder knot ... then your resistors are in parallel.

This latter statement is equivalent to saying that all of the resistors provide paths connecting a voltage A to a voltage B: parallel resistors connect two independent busses.

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Integral

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- #8

mfb

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- #9

Philip Wood

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Note that you can have resistor networks which can't be analysed into series and parallel groupings. An example would be four resistors connected in a ring ABCDA, in which these letters stand for the connections between the resistors. A fifth resistor is connected as a 'bridge' between A and C. The resistance is measured across B and D. This resistance can't be calculated by using series and parallel rules, but Kirchhoff's laws, or some more advanced technique has to be used.

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Do you have any tips for redrawing? When I get a complex circuit like this , how should I approach redrawing it? Is there any method ? Thank you

- #11

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Check out Post #5 from our last PF Physics Trivia:

https://www.physicsforums.com/showthread.php?t=680864

Zz.

Sorry for the offtopic. Will that event take place again?

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