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Finishing Up on Capacitors

This Material Is On The Class Site. Finishing Up on Capacitors. February 10. Howjado ?. Great Good Not So Good Bad Don’t turn your back!. What are we doing. Today Examination I Complete Capacitors Friday DC Circuits Play with batteries, wires and light bulbs Watch for WebAssign .

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Finishing Up on Capacitors

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  1. This Material Is On The Class Site Finishing Up on Capacitors February 10 CAPACITORS

  2. Howjado? • Great • Good • Not So Good • Bad • Don’t turn your back!

  3. What are we doing • Today • Examination I • Complete Capacitors • Friday • DC Circuits Play with batteries, wires and light bulbs Watch for WebAssign . . . Next Week – More of the same

  4. The Capacitor Real World Two pieces of metal close to one another but they don’t touch. Charge has no place to go!

  5. String them together ….. Single Piece of Metal. Not connected to anything - - - - - - - - - - - - - - +++++++ +++++++ electrons electrons electrons

  6. String them together ….. q -q q -q - - - - - - - - - - - - - - +++++++ +++++++ Charge is the same for every capacitor in a series “string”

  7. String them together ….. C1 C2 q -q q -q - - - - - - - - - - - - - - +++++++ +++++++ Wires are equipotentials … sort of.

  8. Two ways to go to the same place! C1 C2 V1 V2 q -q q -q - - - - - - - - - - - - - - +++++++ +++++++ VT

  9. Rule of adding series capacitors

  10. Parallel is Easier! VT

  11. Let’s so some measurementsvia a “demo”

  12. Working Together – But Separately! Model One Single Conductor

  13. PARALLEL Calculate the combined capacitance C1= C2= C1||c2= C1 Measure=__ C2

  14. SERIES (C1+C2)series=

  15. Determine the equivalent capacitance between A and B for the group of capacitors in the drawing. Let C1 = 14 µF and C2 = 5.0 µF.

  16. UNITS • A capacitor which acquires a charge of 1 coulomb on each plate with the application of one volt is defined to have a capacitance of 1 FARAD • One Farad is one Coulomb/Volt

  17. Continuing… • The capacitance of a parallel plate capacitor depends only on the Area and separation between the plates. • C is dependent only on the geometry of the device!

  18. Units of e0

  19. What's Happening? DIELECTRIC

  20. Polar Materials (Water)

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

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

  23. Non-Polar Material

  24. APPLICATION OF GAUSS’ LAW

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

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