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ECE 1270: Introduction to Electric Circuits
Lecture 2: Ohm's Law Chapter 2 Circuit Elements
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Voltage and Current Sources
An Ideal Voltage Source An Ideal Current Source An ideal voltage source will provide a constant voltage across its terminals regardless of the current flowing into those terminals An ideal current source will provide a constant current flowing through its terminals regardless of the voltage across those terminals
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Voltage and Current Sources
____ Controlled Voltage Source ____ Controlled Voltage Source ____ Controlled Current Source ____ Controlled Current Source
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Example 2.1: Valid or Invalid?
(b) (a) Valid: a,b,e, Invalid: c,d (c) (e) (d)
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Example 2.2: Valid or Invalid?
(c) Valid: b,c Invalid: a,d (b) (d)
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AP 2.1
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Ohm's Law R =Electrical Resistance [Ω] v = Voltage [V] i = Current [A]
Resistance is created by the atoms in a material through which the electrons are moving
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Example 2.4: Circuit Model of a Flashlight
Lamp Coil Wire Metal Case Switch
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P2.9, P2.11
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