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Agenda

Agenda. Today Chapter 24 (Finish Fri & Start 25) HMWK Due Fri Return Quiz Friday Reading Finish ch. 24 by Friday Skim 25 (at least last page) Friday Read 25 by Monday. Simplest Form: || Plate. Apply Voltage Across Parallel Plates V = Ed E (plate) = s/(2ke 0 ) E (Between) = s/(ke 0 )

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Agenda

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  1. Agenda • Today • Chapter 24 (Finish Fri & Start 25) • HMWK Due Fri • Return Quiz Friday • Reading • Finish ch. 24 by Friday • Skim 25 (at least last page) Friday • Read 25 by Monday

  2. Simplest Form: || Plate Apply Voltage Across Parallel Plates V = Ed E (plate) = s/(2ke0) E (Between) = s/(ke0) s = Q/A Infinite just approximation E = Q/(Ake0) V = Ed V = Qd / (Ake0)

  3. Simplest Form: || Plate Apply Voltage Across Parallel Plates V = Qd / (Ake0) Capacitance = Ability to store Charge from V Q = V C [C is capacitance] V = Q / C || plate: C = Ake0/d Examine parameters Geometric & material only, no field dep.

  4. Energy Storage: Capacitor • Consider how much energy it takes to move charges from one plate to another • “Assemble” Charges • Work done in moving charges stored as Potential Energy

  5. Energy Storage: Capacitor Can Apply Top Equation to Bottom Mix & Match, Q,V,C As usual, ½  Integration

  6. Other Geometries • Spherical, other all have different formulas for capacitance • Universal: • C depends only on dielectric & geometry • Q = VC • PE = Q2/2C

  7. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One…

  8. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One… To Two capacitors attached like this? Does V Change? Does Q Change? Depends on outside Capacitance internal!

  9. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One… To Two capacitors attached like this? Is Same as…

  10. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One… To Two capacitors attached like this? Is Same as… Twice the Area Twice the capacitance..

  11. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One… To Two capacitors attached like this? Comment on the charge at these 2 points? Must be Equal & opposite? How about must be same? So Effective Capacitor looks like….

  12. || Plate CombinationsC = Ake0/d How does capacitance change if we go from One… To Two capacitors attached like this? Effective Distance between plates doubled Capacitance halved

  13. Series & ParallelFirst Look Parallel Capacitors Capacitance Increased Series Capacitors Capacitance Reduced

  14. Future • Next Week • Monday: Ch.25 • Need to Miss Wed? • Class Canceled or Sub? • Sub = Quiz Wed, Lecture & Lab Tues • No Sub = Skip Lab, Quiz & Lecture Tues • Quiz on Problem from CH. 21-23

  15. What?Alternative Energy Research • New (hopefully) multi-year investigation • Exploring new materials for use in hydrogen energy storage and solar power • Chemistry & Chemical Bonding • Nanoscience measurement and analysis • Materials Science • Engineering: Design, Implementation, and Development • Integration with future and current teachers • Integration with science policy

  16. Who? • Students interested in engineering • Electrical, materials, systems • Good with hands, not afraid of electricity • Willing to learn CAD design • Students interested in Experimental Science • Chemistry/Physics Mixture • Materials grown @ UNI, Nanostructures formed here • Analysis (SEM, AFM, STM) & Feedback • Understand, Predict, Create Novel materials • Students interested in Science Education • Perform Experimental Research • Work with junior high & high school teachers • Develop curriculum & research

  17. How Many? • Looking for another 2 or 3 students • Summer & perhaps beyond • Need: AFM Operator Nanoscale Objects Several atoms high (<10) Template for High Efficiency Solar Cell

  18. How Many? • Looking for another 2 or 3 students • Summer & perhaps beyond • Need: SEM/EDX Operator? Microstructure Characterization Chemical Information Also

  19. How Many? • Looking for another 2 or 3 students • Summer & perhaps beyond • Need: UHV /Elecronics Engineer • Begin by implementing, Work towards Design

  20. Modeling • Work towards understanding of fundamental science • Experience with programming a + • Understand phenomena

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