Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in star connection. After transforming to delta, the resistance at A will be?

Rab is the resistance between the terminals A and B, Rbc between B and

1.	Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in star connection. After transforming to delta, the resistance at A will be?
A.	Rc+Rb+Rc*Rb/Ra
B.	Rc+Rb+Ra*Rb/Rc
C.	Ra+Rb+Ra*Rc/Rb
D.	Rc+Rb+Rc*Ra/Rb
Answer» B. Rc+Rb+Ra*Rb/Rc

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Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in star connection. After transforming to delta, the resistance at A will be?

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