# lec2 - Fundamentals of Electrical Engineering 2009...

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Fundamentals of Electrical Engineering 2009 Electronic & Telecommunication Engineering Danang University of Technology

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Lecture 2 Circuit Elements (chapter 2)
Preview Understand the behavior of the ideal basic circuit elements: independent/dependent voltage and current sources, and resistors. Use Ohm’s law, Kirchhoff’s current law (KCL) and Kirchhoff’s voltage law (KVL) to analyze circuits. Know how to calculate the power for each element in a simple circuit, be able to determine if the power is balanced for the whole circuit

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Electrical sources A device which is capable of converting from non- electric energy to electric energy and vice versa. Examples: Discharging battery: chemical energy - electric energy Charging battery: electric energy - chemical energy Dynamo: mechanical energy - electric energy Motor: electric energy - mechanical energy These sources can either deliver or absorb electric power These sources can maintain either voltage or current
Classification of electrical sources Ideal voltage source - Being a circuit element - Maintaining a prescribed voltage across its terminals regardless of the current flowing in those terminals Ideal current source - Being a circuit element - Maintaining a prescribed current flowing in its terminals regardless of the voltage across those terminals

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Classification of Ideal Electrical Sources Independent source - Establish a voltage or current whose value does not depend on the value of a voltage or current elsewhere in the circuit. - We can specify the value of voltage/current by the value of the voltage/current source alone Dependent source - Establish a voltage or current whose value depends on the value of a voltage or current elsewhere in the circuit. - We can’t specify the value of voltage/current unless we know the value of voltage/ current on which it depends
Circuit symbols for IES x s v v μ = x s i v ρ = x s v i α = Voltage- controlled voltage source (VCVS) + - + - Voltage- controlled

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lec2 - Fundamentals of Electrical Engineering 2009...

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