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    shahroze123's Avatar
    shahroze123 Posts: 1, Reputation: 1
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    #1

    Sep 2, 2014, 09:40 PM
    What is equivalent resistance in the following circuit and how?
    http://i.stack.imgur.com/eIggZ.png every resistance is of 1 ohm
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 3, 2014, 11:55 AM
    Hint - there's interesting symmetry going on around R3. Suppose R3 was infinite - what would the equivalent resistance for the circuit be? Now suppose R3 is 0 - again, what would the equivalent resistance be?

    Or you can do it the hard way. Assume a voltage across A-B of, say, 10 volts, and determine the total current flow. The current flow through each of the 5 resistors are unknowns, and you can set up 5 equations using Kirchoff's circuit laws. Solve for the currents, then find the total current I. The equivalent resistance is 10volts/I.

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