1 Resistive Circuits (Voltage Divider Stack and ∆ ↔ Y transformation) Lab 5a2 Equipment List • DC power supply • Decade resistance box • ResistorsVoltage Divider Stack • Design and simulate DC response of the VD stack circuit in P-Spice • Build the VD stack circuit shown (hardware experiment) 3Voltage Divider Stack • Use the multimeter to measure the voltages across the resistances and the current flowing in through the circuit – Voltage Measurement: Connect the multimeter in parallel. Use the rightmost HI and the rightmost LO terminals. Push the DC V button – Current Measurement: Use Ohm’s Law – It is usually easier to measure voltages rather than current 4∆ ↔ Y Transformation • The transformation is used to establish equivalence for networks with three terminals. Where three elements terminate at a common node and none are sources, the node is eliminated by transforming the impedances. 5Simulation Example • Build the circuit shown below (in P-Spice) and measure the source current Is. 6Simulation Example (Contd.) • Solve for resistors R6, R7, R8 using ∆↔Y transformation, such that source current Is remains same as the circuit in previous slide and simulate the circuit. 7Lab Experiment • Build the circuit shown below (hardware lab) and measure the source current Is. 8Lab Experiment (Contd.) • Build the circuit designed in slide 7 (in hardware lab) and measure the source current Is. (Use same values of R6, R7 & R8) 9Questions • Are both source currents measured for 2 circuits from slides 8 and 9 same? Why?
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