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Lecture2010-2

# Lecture2010-2 - Chapter 2 Basic Circuit Elements Preview of...

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Chapter 2 – Basic Circuit Elements, Preview of Circuit Analysis

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Independent Source - Excitation Voltage Current
Connection Among Sources - Consistency

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Observations Voltage sources must match at nodes. Current sources must match in a loop. Voltage source can provide variable current. Current source can generate variable voltage.
Resistor

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Resistors
Physics of Resistance http://www.regentsprep.org/Regents/physi Resistance Value: Large cross-section, smaller resistance Longer path, larger resistance

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Two Resistors Parallel equivalent to increasing cross-section; lower resistance 1/R = 1/R1 + 1/R2 Series equivalent to increasing length; higher resistance R = R1 + R2
Characteristics of Resistor Resistance Value to M Power Rating 1/4W, 1W, 10W Accuracy 5%, 10% Temperature Sensitivity

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Inverse Resistance Conductance Inverse of R unit: S (Siemens), mS; Why? 1/R = 1/R1 + 1/R2 becomes G = G1 + G2 R G 1 = 1 -
Response of Resistor Current = Voltage / Resistance Power = Current x Voltage R I V R V I = = R V P R I P V I P 2 2 = = =

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Example 10 V across 1 k I = 10 / 1 k = 1 mA P = I x V = 10 mW
Preview of Circuit Analysis - Solving Voltage and Current

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Sign V is positive if potential at + node is higher than potential at – node. Node with positive current in is at higher potential.
Natural Sign Current flowing into a resistor, voltage positive

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Voltage Source: Determine I G V R V I = = http://www.expertvillage.com/video/4773_electronic-circuit-currents.htm Voltage source generates a current.
Current Calculation Ohm’s Law: I = Vg / R

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Current Source: Determine V R I G I V = = Current source produces a voltage.
Examples – One Source, One Resistor

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Lecture2010-2 - Chapter 2 Basic Circuit Elements Preview of...

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