Star and delta transformation


Question 1: Three equal resistances of value R ohms are joined in a delta fashion as shown in figure below. If this is to be replaced by an equivalent star connected resistances R1, R2 and R3 in terms of R?

936_star circuit.jpg

Question 2: Compute the equivalent delta connected resistance values for the given star connected resistance.

496_delta to star.jpg

Question 3: Deduce the expressions for the resistance of a series and parallel circuit.

Question 4: Derive the expressions for the inductance of a series and parallel circuit.

Question 5: Derive the expressions for the capacitance of a series and parallel circuit.

Question 6: Give a detailed comparison of series and parallel circuit.

Question 7: Find out the current in all the bridge arms of the circuit as shown in figure below. Find out the value of the current through the galvanometer and its direction. (Galvanometer and all resistances are in ohms).

2129_bridge circuit.jpg

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Electrical Engineering: Star and delta transformation
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