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Contact Supplieraii new thevenin theoram according to thevenin's theoram, any two terminal linear network can be replaced by an equivalent circuit consisting of a voltage source (vth) and a series resistance (rth). The thevenin voltage vth is the open circuit voltage at the output terminals and the thevenin resistance rth is equal to the resistance between the output terminals, when the voltage sources in the network are replaced by their internal resistances. (the thevenin resistances is also equal to the ratio of the open circuit voltages to the short circuit current at the output terminals). by making an electrical network and its thevenin equivalent circuit, the voltages and currents in the two circuits, for various load resistances are compared. specifications:power supply: 0 - 6 v dc variable at 1000 ma resistances: 5 of different values 100, 220, 330, 520, 560 ohms etc. potentiometer: for variable resistancestep switch voltmeter: 0 to 6 volt dc 65 mm round optional: digital multimter (for resistance).