Q. In a delta network, each element has a value of 3 ohms. The value of each element in equivalent star network will be:

A
1 Ohm
B
6 Ohm
C
1.5 Ohm
D
9 Ohm
Solution:

The equivalent star resistance connected to a given terminal, is equal to the product of the two delta resistances connected to the same terminal divided by the sum of the delta connected resistances.
If the delta connected system has the same resistance R at its three sides then equivalent star resistance r will be,

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