1.

If the Δ impedances are Za, Zb and Zc and the Y impedances are Z1, Z2 and Z3, then which one of the following relations is correct?

A. Z1 = ZaZbZc
B. \({Z_1} = \frac{1}{{{Z_a} + {Z_b} + {Z_c}}}\)
C. Z­1 = Za + Zb + Zc
D. \({Z_1} = \frac{{{Z_b}{Z_c}}}{{{Z_a} + {Z_b}+{Z_c}}}\)
Answer» E.


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