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Alternating Current (AC) Circuits

Alternating Current (AC) Circuits. AC Voltages and Phasors Resistors, Inductors and Capacitors in AC Circuits RLC Circuits Power and Resonance. AC Sources and Phasors. Consider a sinusoidal voltage source:. This source can be represented graphically as a vector called a phasor :. b. b.

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Alternating Current (AC) Circuits

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  1. Alternating Current (AC) Circuits • AC Voltages and Phasors • Resistors, Inductors and Capacitors in AC Circuits • RLC Circuits • Power and Resonance

  2. AC Sources and Phasors Consider a sinusoidal voltage source: This source can be represented graphically as a vector called a phasor: b b Vmax Vmax V(t) T a wt e c a,e c time -Vmax d d Great web page: http://www.phys.unsw.edu.au/%7Ejw/AC.html

  3. Resistors in AC Circuits Since both have the same arguments in the sine term, iR and DvR are in line, they are in phase.

  4. Root Mean Square (RMS) Current and Voltage

  5. Announcements • Cell phones on silent • Check mid-term grades.

  6. Inductors in AC Circuits Inductive Reactance For a sinusoidal voltage, the current in the inductor always lags the voltage across it by 90°.

  7. Inductors in AC Circuits • Filter for woofer • Low frequencies pass through • High frequencies get blocked. VR Frequency Woofer

  8. Capacitors in AC Circuits Capacitive Reactance For a sinusoidal voltage, the current in the capacitor always leads the voltage across it by 90°.

  9. Inductors in AC Circuits • Filter for tweeter • High frequencies pass through • Low frequencies get blocked. VR Frequency Tweeters

  10. RLC Series Circuit

  11. Using Phasors in a RLC Circuit Impedance

  12. Example 33.5 R = 425 W L = 1.25 H C = 3.5 mF w = 377 s-1 DVmax = 150 V

  13. Power in an AC Circuit No power loss occurs in an ideal capacitor or inductor. For a purely resistive load, f=0

  14. Resonance in Series RLC Circuits A circuit is in resonance when its current is maximum. Irms=max when XL-XC=0 Resonance Frequency Tuner for radio!

  15. www.barlowwadley.it Inductor Variable Capacitors

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