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If the resistors of star connected system are R1, R2, R3 then the resistance between 1 and 2 in delta connected system will be?(a) (R1R2 + R2R3 + R3R1)/R3(b) (R1R2 + R2R3 + R3R1)/R1(c) (R1R2 + R2R3 + R3R1)/R2(d) (R1R2 + R2R3 + R3R1)/(R1+R2)The question was posed to me by my college professor while I was bunking the class.I'm obligated to ask this question of Star-Delta Transformation topic in section Useful Theorems in Circuit Analysis of Network Theory

Answer»

Correct OPTION is (a) (R1R2 + R2R3 + R3R1)/R3

To explain: After TRANSFORMATION to delta, the resistance between 1 and 2 in delta connected system will be (R1R2 + R2R3 + R3R1)/R3 and this resistance LIES between R1, R2 in delta connection.



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