1 / 13

Lecture 12 Electromagnetic Oscillations and Alternating Current Chp. 33

Lecture 12 Electromagnetic Oscillations and Alternating Current Chp. 33. Cartoon -. Opening Demo - Warm-up problem Physlet Topics LC Circuit Qualitatively Electrical and Magnetic energy oscillations Alternating current Pure R and L, circuti Series RLC circuit Power and Transfomers

ezra
Download Presentation

Lecture 12 Electromagnetic Oscillations and Alternating Current Chp. 33

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture 12 Electromagnetic Oscillations and Alternating Current Chp. 33 • Cartoon -. Opening Demo - Warm-up problem • Physlet • Topics • LC Circuit Qualitatively • Electrical and Magnetic energy oscillations • Alternating current • \Pure R and L, circuti • Series RLC circuit • Power and Transfomers • Demos • LR circuit • Series LRC circuit

  2. B Axis of rotation Coil of wire Where w is the rotational angular frequency of the generator w= 2pf and f= 60 Hz

  3. phase Instantaneous voltage time Phase constat Amplitude Angular frequency Phasor diagram

  4. L = 4.22mH VR=RI VL= XLIL or VL= (Lw)Isince I=IL

  5. Impedance Z: New quantity for AC circuits. This is analogous to resistance in DC circuits

  6. RL Circuit Example Suppose em = 100 volts, f=1000 Hz, R=10 Ohms, L=4.22 mH, Find XL, Z, I, VR, and Vl.

  7. Power in AC circuits Instantaneous power doesn’t mean anything Need to average over time or one period of the sine wave Note

  8. Averaging over a sine curve

  9. Calculate Power lost in resistor from example To calculate power produced by the generator you need to take account of the phase difference between the voltage and the current. In general you can write: For an inductor P = 0 because the phase difference between current through the inductor and voltage across the inductor is 90 degrees

  10. Series LRC circuit VR VC XC=1/(wC) VL XL=wL ELI the ICE man

  11. Resonance Series LRC demo

  12. 10 uF 4.25 mH

  13. Series LCR circuit

More Related