Question

Use delta-star conversion to find resistance between terminals ‘AB’ of the circuit shown in Fig.. All resistances are in ohms.

Answer 1

First apply delta-star conversion to CGD and EDF, so as to redraw the part of the circuit with new configuration, as in Fig.

Simplify to reduce the circuit to its equivalents as in Fig. and later as in Fig. . Convert CHJ to its equivalent star as in Fig. . With the help of series-parallel combinations, calculate R_AD as

R_AB = 5.33 + (1.176 × 4.12/5.296) = 6.245 ohms