# lec7 - Fundamentals of Electrical Engineering 2009...

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Fundamentals of Electrical Engineering 2009 Danang University of Technology

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Lecture 7 Response of First-Order (chapter 7)
Preview Be able to determine the natural response of both RL Be able to determine the step response of both RL & RC circuits Know how to analyze circuits with sequential switching Be able to analyze op-amp circuits containing resistors & a single capacitor

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Recall: both inductors and capacitors can store energy How to determine the i(t) and v(t) that arise when energy is either released or acquired by an L or a C in response to an abrupt in a DC voltage or current source ? Natural response: i(t) & v(t) that arise when stored energy in L or C is suddenly released to a resistive network Step response : i(t) & v(t) that arise when energy is being acquired by an L or a C due to the sudden application of a DC voltage or current source Develop a general method that can be used to find the response of RL & RC circuits to any abrupt changes
First-order circuit Def: First-Order Circuit: circuit whose voltages and currents are described by first-order differential equations. Examples: – RL circuits: only sources, resistors (R), inductors (L) – RC circuits: only sources, resistors (R), capacitors (C) – RLC? chapter 8

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Response : currents and voltages that arise when energy is acquired or released by a circuit (in particular, by an inductor or a capacitor). Natural Response : no external sources (sources have been abruptly disconnected) Step Response : sudden application of DC current or voltage. Also distinguish:
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## This note was uploaded on 04/02/2010 for the course EE EE taught by Professor Tai during the Spring '10 term at Punjab Engineering College.

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lec7 - Fundamentals of Electrical Engineering 2009...

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