The main objectives of this lab

are to work through the procedural steps involved in Thevenin’s theorem, verify

the values obtained by measuring them using the multimeter, finally to

construct Thevenin equivalent circuit.

The equipment used in this lab:

· Regulated DC supply

· Mutimeter

· Breadboard

· Resistors (100?( ´ 2),

1k?( ´

7), 1.5k?, 2.2k?( ´

3), 3.3k?, 4.7k? and 10k?)

Figure 1

The theorem can be used to

analyse networks with sources that ae not in series or parallel and to minimize

the number of components required to put in place the same characteristics at

the output terminals. The theory behind this theorem is to simplify any complex

circuit. It expresses that for a linear electrical system any blend of voltages

sources, current sources and resistors with two terminals can be diminished to

one voltage source, one current source and one resistor since it is

electrically identical. However, when you simplify the circuit, some

calculations need to be done to obtain the values for the Thevenin equivalent

circuit. Firstly, we will need to remove that part of the network where the Thévenin

equivalent circuit is found. Afterwards, to calculate RTH we need to

set all sources to zero, that means that voltage sources need to be replaced by

short circuits and current sources by open circuits, then find the resultant

resistance between the two terminals. Then, to calculate VTH, we must

reset all the sources to their original state and then find the open-circuit

voltage between the marked terminals. Finally, to calculate the current we use

the formula .

to clarify the situation, Figure 1 is going to be our example.

Finally, Thevenin

theory is here to say that we can go from a difficult circuit to analyse to an

easy circuit to analyse.

This lab will help us

understand this theory more by proving Thevenin’s theory in a practical

experiment.