Lecture_17 - AC circuits: inductive reactance, capacitive...

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1 AC circuits: inductive reactance, capacitive reactance, impedance and admittance CHM6158C - Lecture 17 Mar 29 Notes from Gibilisco; Teach Yourself Electricity and Electronics, McGraw-Hill, Chapters 13-15 voltage-current profiles of L, C, RL, RC and circuits impedance of RL, RC and RLC circuits
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2 Inductive reactance (X L ) inductance = property of circuit where change in electric current through the circuit induces an electromotive force that opposes the change in current = …. . Increase AC frequency – what will be the effect? fL X L 28 . 6 = Inductive reactance: Inductance (Henrys = Ω s) Frequency (Hz)
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3 Examples inductance = 0.50 H, frequency = 60 Hz, what is X L ? for the same circuit as above, we use a battery with 12 VDC, what is X L ? What are the units of X L ?
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4 Voltage-current profile Current lags driving (source) voltage For pure inductance circuit For pure resistance circuit Current in phase with driving (source) voltage
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5 Inductive reactance and resistance
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6 Combined inductance and resistance
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7 Phase angle Apply Pythagoras to obtain hypotenuse = impedance sin φ =
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Lecture_17 - AC circuits: inductive reactance, capacitive...

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