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Ye olde capacitor 8.3

Ye olde capacitor 8.3. Instructor Course. Today & Beyond. Quiz Material on Capacitors not in the unit. Complete the unit (9) SPRING BREAK RETURN Monday – Begin Unit on Magnetism. (Bring to class) Wednesday – EXAMINATION #2 / Bring in units 4-9 / Lab Reports Due.

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Ye olde capacitor 8.3

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  1. Ye olde capacitor8.3 InstructorCourse

  2. Today & Beyond • Quiz • Material on Capacitors not in the unit. • Complete the unit (9) • SPRING BREAK • RETURN • Monday – Begin Unit on Magnetism. (Bring to class) • Wednesday – EXAMINATION #2 / Bring in units 4-9 / Lab Reports Due. • Friday – Continue magnetism unit.

  3. What is the current through the 4- resistor in this circuit? a) 0.67 A b) 0.75 A c) 1.0 A d) 1.5 A e) 4.5 A Text Answer

  4. What's Happening? DIELECTRIC

  5. Polar Materials (Water)

  6. Apply an Electric Field Some LOCAL ordering Larger Scale Ordering

  7. Adding things up.. - + Net effect REDUCES the field

  8. Non-Polar Material

  9. APPLICATION OF GAUSS’ LAW

  10. We can measure the C of a capacitor (later) C0 = Vacuum or air Value C = With dielectric in place C=kC0

  11. Dielectric Breakdown!

  12. Recall the experiment – • Voltage across C seemed to drop rather than stay stable. • You were given a second capacitor and it held it’s value. • What’s going on??? • meters have resistors of 1-10MW

  13. Let’s talk about this…

  14. 20.13 RC Circuits Capacitor charging time constant

  15. 20.13 RC Circuits Capacitor discharging time constant

  16. Stored Energy • Charge the Capacitor by moving Dq charge from + to – side. • Work = Dq Ed= Dq(V/d)d=DqV

  17. DW=DqV=Sum of strips DV

  18. Energy Density

  19. A Thunker Find the equivalent capacitance between points a and b in the combination of capacitors shown in the figure. V(ab) same across each

  20. Let’s Finish the Unit

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