A.1) Apply the delta-star conversion to resistors R1, R2 and R3 of the circuit in Figure 2. Obtain the star equivalent and calculate the total current flowing through this circuit. Calculate the current through resistors R4 and R5. Calculate the voltage at points A and B. Guiding comment: Note that VA = VR4 and VB = VRS. A.2) Calculate the current flowing through resistor R2 in the original Wheatstone bridge circuit. Guidance comment: Note that VR2 =VAB = VA-VB. Figure 2: Wheatstone bridge circuit for delta-star conversion.

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Nodal Analysis

In the analysis of any electric circuit, nodal analysis is the method of determining the potential difference or voltage between different nodes in an electric circuit. A node is a point where two or more branches connect each other. In the nodal analysis, the voltages are determined in the terms of branch currents. The nodal analysis is also known as the node voltage method or branch current method. The nodal analysis method is one of the several applications of Kirchhoff's Current Law (KCL).