Network Theorem Trainer Model NW-2 is used for verification of the three theorems. They are Thevenin's theorem, Norton's theorem and Maximum power transfer theorem. In order to perform these, the trainer has necessary facilities, like variable voltage source, assorted values of resistors, center-Zero current and built in power supplies. Experiments are performed by using patch cords. Study of Thevenin's Theorem:-
The Thevenin?s theorem is a process by which complex circuit is reduced to an equivalent series circuit consist of a single voltage source, a series resistance and a load resistance. Once Thevenin?s equivalent circuit is arrived at, then it becomes easy to determine the load current and the voltage across this load. Study of Norton's Theorem: -
Norton?s theorem states that, the current in any conductance or resistor, connected to a network is the same, if the conductance or resistance was connected to a current source, where:
1. The source current is the short circuit current, and the network conductance or resistance
looking into the network at the open load terminals
2. With source removed is the equivalent network conductance. Therefore a single ideal current source and a parallel resistor with two terminals can replace combinations of voltage sources, and impedance?s. Maximum Power Transfer Theorem (resistive load): -
The maximum power will be transferred to a load when it matches the internal resistance of the source. It is possible to see how this is modified for non-resistive loads also. Specifications:
Voltage source : Variable in the range of ? 1.5 to 15V DC @ 300mA
Fixed +5V DC @ 300mA
Meter : 25-0-25mA analogue current meter
Passive components : Suitable value resistors to perform the above task
Enclosure : The entire instrument is housed in an ergonomically designed Cabinet. Note: It is desirable to have an external Digital multimeter. |
