Show how whould you join 3 resistance each of 9 ohm show that the equivalent resistance is 13.5 ohm and 6 ohm.
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When we connect two resistance of the same value in parallel the equivalent
resistance will be half of their value which is 4.5 ohms. By putting
9 ohms resistance in series with this combination will give us
9+4.5=13.5ohms
In the lower figure when we put two resistors in series, their equivalent
resistance will be 18 ohms which is parallel with 9 ohm resistance.
Requivalent=19*9/(9+18)=6ohms
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