Evaluate the operation of Thevenin and Norton theorems used in the tasks 3 and 4, by firstly describing the methods which had to be applied according to each theorem. Comment on whether there is any difference in the magnitude of the equivalent resistance from a Thevenin/ Norton application to the same circuit. Can Norton / Thevenin equivalent circuits be interchanged. Comment on whether either or both theorems can be used in an AC circuit and, if so, what will be the equivalent circuit component used instead of resistance. Task 3: In the network shown below (fig 3), the battery has negligible internal resistance. Using Thevenin's theorem, find the current flowing in the 80 resistor 80 80 2002 2002 160 160 Figure 3: Battery connected to a resistor network DC circuit TASK 4: In the network shown below (fig 4), the battery has negligible internal resistance. Find using Norton's theorem the current flowing in the 80 resistor. 120 120 40 40 40V 40V

Evaluate the operation of Thevenin and Norton theorems used in the tasks 3 and 4, by firstly describing the methods which had to be applied according to each theorem.

Comment on whether there is any difference in the magnitude of the equivalent resistance from a Thevenin / Norton application to the same circuit. Can Norton / Thevenin equivalent circuits be interchanged.

Comment on whether either or both theorems can be used in an AC circuit and, if so, what will be the equivalent circuit component used instead of resistance.