# Lab: Circuit Theory

**Topics:**Thévenin's theorem, Electrical network, Norton's theorem

**Pages:**4 (924 words)

**Published:**March 5, 2013

The objectives of this experiment are to investigate and verify the Thevenin’s theorem and to investigate and verify the Norton’s theorem. EQUIPMENT

Resistor 100Ω, 1kΩ and 4.7kΩ, digital multimeter(DVM), bread board. INTRODUCTION

Some circuits require more than one voltage source. Superposition theorem is a way to determine currents and voltages in a linear circuit that has multiple sources by taking one source at a time. the current in any given branch of a multiple-source linear circuit can be found by determining the currents in that particular branch produced by each source acting alone, with all other sources replaced by their internal resistances. The total current in the branch is the algebraic sum of the individual source currents in that branch. Thevenin’s theorem provides a method for simplifying a circuit to a standard equivalent form. This theorem can be used to simplify the analysis of series-parallel circuits. The Thevenin’s equivalent voltage (VTH) is the open circuit (no-load) voltage between two specified output terminals in a circuit. The Thevenin’s equivalent resistance (RTH) is the total resistance appearing between two specified output terminals in a circuit with all sources replaced by their internal resistance. Another method for simplifying a circuit to an equivalent form is Norton’s theorem. By reducing all of the element of a complex circuit to a single current source and a single source resistance, which supply power load, a simple circuit can be created.

PROCEDURE

Experiment 1: Super position theorem

Figure 1

The circuit connected as shown in figure 1. The current flow through each resistor is measured by using DVM. the current flow in each resistor are measured when V1 is removed. V 1 is reconnected and V2 is removed and the current flow in each resistor is measured. The values are recorded in Table 1. The actual current flows through each resistor are determined by superimposing all the currents in PART A...

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