AC Thevenin's Theorem Any combination of sinusoidal AC sources and impedances with two terminals can be replaced by a single voltage source e and a single series impedance z. The value of e is the open circuit voltage at the terminals, and the value of z is e divided by the current with the terminals short circuited. In this case, that impedance evaluation involves a series-parallel combination. Thevenin voltage Thevenin resistance Numerical example Norton equivalent to DC Version

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AC Thevenin Example To replace a network by its Thevenin equivalent, compute the Thevenin voltage: the output of the voltage divider formed by and . The Thevenin impedance is the impedance looking back from AB with replaced by a short circuit and is therefore a a series-parallel combination. For impedances = + j = + j = + j with supply voltage = V, the Thevenin voltage would be = + j V =V at degrees. The Thevenin impedance is = + j = ohms at degrees. Thevenin resistance Thevenin voltage DC example Norton equivalent

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