Table 1 shows the equivalent Star and equivalent Delta resistances.
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| Table . 1 |
Example 1: Convert the given Delta in the Fig. 1 into equivalent Star.
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| Fig. 2 |
Solution : Its equivalent Star is as shown in the Fig. 2.
Where
R1 = (10 x 5 )/(5 +10 + 15) = 1.67 Ω
R2 = (15 x 10)/(5 +10 + 15) = 5 Ω
R3 = (5 + 15)/(5 + 10 + 15) = 2.5 Ω
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| Fig. 3 |
Example 2.: Find equivalent resistance between points A-B.
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| Fig. 4 |
Solution : Redrawing the circuit,
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| Fig. 4(a |
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| Fig. 4(b |
RAB = (21 x 14)/(21 + 14) = 8.4 Ω
Example 3 : Find equivalent resistance between point A-B.
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| Fig. 5 |
Solution : Redraw the circuit,
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| Fig. 5(a |
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| Fig. 5(b |
RAB = 8.4 Ω