1.

Ra is resistance at A, Rb is resistance at B, Rc is resistance at C in star connection. After transforming to delta, what is resistance between A and C?

A. Ra+Rb+Ra*Rb/Rc
B. Ra+Rc+Ra*Rc/Rb
C. Ra+Rb+Ra*Rc/Ra
D. Ra+Rc+Ra*Rb/Rc
Answer» C. Ra+Rb+Ra*Rc/Ra


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