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Capacitance

Capacitance. Demonstrations & notes. Warning Capacitors can act like High Voltage batteries, but more fatal! (unless it’s a flux capacitor).

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Capacitance

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  1. Capacitance Demonstrations & notes

  2. Warning Capacitors can act like High Voltage batteries, but more fatal! (unless it’s a flux capacitor)

  3. Capacitor uses:1. store energy for later use(like a battery)2. Powerful discharge of current(spot welding, flash cameras)3. Smooth/filter out current fluctuations (motors run better, less noise in sensitive circuits, less interference pick-up)

  4. Basic Capacitor Extra + charge piles up on the left; other + charge is taken from the right

  5. Dielectric adds capacitance C= eA/d e= permitivity (polarizability) e= 1 air or vacuum 3 paper 10 glass 100 water 1000 ceramics

  6. Types: paper Cheap <500V Low capacitance Sensitive to moisture

  7. Types: ceramic Cheap Can handle 10kv Low capacitance robust

  8. Types: electrolyte Polarized (if connect wrong, might explode!) <500V high capacitance Chemicals inside

  9. Make your own

  10. Capacitors • stores energy in the E field • Capacitance is a measure of the ability to store energy in the form of separated charges • Capacitors take time to charge and discharge

  11. Capacitance Equations Q = total charge Units: farads = C/V 0 = permittivity constant (C2/Nm2) A = area of plate d = Distance between plates

  12. Energy and CapacitorsEquations

  13. Capacitors in Series: same charge, share the voltage

  14. Capacitors in Parallel Same voltage, but share the charge Q = Q1 + Q2 + Q3 CPV = C1 V + C2V + C3V CP = C1 + C2 + C3

  15. References:http://www.sentex.net/~mec1995/circ/hv/hvcap/hvcap.htmlReferences:http://www.sentex.net/~mec1995/circ/hv/hvcap/hvcap.html www.answers.com/topic/capacitor

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