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1、Thevenins Theorem(2)1.Problem-solving steps-+ocUabLineartwo-terminalcircuit(1)Calculating Uoc Equivalent transformation Superposition theorem Nodal analysis Mesh analysis 0I eqRabLinear circuit withall independentsources set equalto zeroab-+ocUeqR(2)Calculating Req(3)Drawing Thevenin equivalent circ
2、uit By means of combining resistors in series or in parallel,or sometimes,wye-delta transformations.1.Problem-solving steps Practice problem:Try to use Thevenins theorem to solve the current I in the circuit.3A1020V101A6V4ISolution:(1)Calculating Uoc 3A1020V101A6VocUAB1A 2A oc6 10 1 103 12024 VU (2)
3、Calculating Req(3)Drawing Thevenin equivalent circuit and calculating I 101010 1020 eqR4I24V20241 A204I(1)The Thevenin equivalent circuit is equivalent to the external branch but not to the internal network.(2)The two-terminal network is required to be linear.However,the external circuit can be linear or nonlinear.(3)In Thevenin equivalent circuit,the voltage polarity of source should be consistent with that of open circuit voltage in two-terminal network.2.Conclusions