# Equivalent Circuits

May 14th, 2015
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• One-port networks and equivalent circuits– Thevenin equivalent circuit– Norton equivalent circuit. One-port networks and equivalent circuits• Two-terminal linear circuits can be replaced by an equivalent circuit

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Lecture6 Slides 1 EE1002\CG1108Lecture 6August 14EE1002\CG1108, ECE, NUS1Equivalent Circuits One-port networks and equivalent circuits Thevenin equivalent circuit Norton equivalent circuitAugust 14EE1002\CG1108, ECE, NUS2One-port networks andequivalent circuits Two-terminal linear circuits can bereplaced by an equivalent circuitconsisting of a source and a resistance. A voltage source with a series resistance(Thevenin equivalent circuit) A current source with a parallel resistance(Norton equivalent circuit)August 14EE1002\CG1108, ECE, NUS3Thevenin equivalentRLRL A voltage source in series with a resistance The voltage source is called Theveninsvoltage The series resistance is called TheveninsresistanceAugust 14EE1002\CG1108, ECE, NUS4Thevenin Voltage Value of the voltage source is the opencircuit voltage between the two terminals Called the Thevenin voltageAugust 14EE1002\CG1108, ECE, NUS5Thevenin Resistance Find the short circuit current between thetwo terminals Calculate the Thevenin resistanceAugust 14EE1002\CG1108, ECE, NUS6Norton EquivalentRLRL A current source in parallel with a resistance The current source is called Nortons current The series resistance is called TheveninsresistanceAugust 14EE1002\CG1108, ECE, NUS7Nortons current Value of the current source is the shortcircuit current between the two

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