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17.7 Capacitance

17.7 Capacitance Ratio of the charge on a conductor to the potential difference between the conductors. Units of farads (F) Usually in μ F or pF (10 -12 F). 17.7 Capacitance For a parallel-plate capacitor: Applications: cameras, computers, TVs, noise filters, starter motors, etc.

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17.7 Capacitance

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  1. 17.7 Capacitance • Ratio of the charge on a conductor to the potential difference between the conductors. • Units of farads (F) • Usually in μF or pF (10-12 F) APHY202

  2. 17.7 Capacitance • For a parallel-plate capacitor: • Applications: cameras, computers, TVs, noise filters, starter motors, etc. APHY202

  3. 17.8 Dielectrics • An insulating material placed between plates of a capacitor that increases the capacitance: C = κCo • The polarization of the dielectric will cause an decrease in the electric field. • Application: measure humidity in air APHY202

  4. 17.9 Storage of Electric Energy • Work done to move Δq through V is ΔW= VΔq • Total work = ½QV • PE stored = ½QV = ½CV2 = Q2/2C • The energy is stored in the electric field between the plates with a density of ½ εoE2. • Defibrillators APHY202

  5. 17.9 Storage of Electric Energy 1) Battery Compartment 10 2) Capacitor 3 7 3) Transformer 4) Capacitor 11 5) Diode 1 6) Transformer 4 6 7) Neon Indicator Light 8 8) Capacitor 9 9) Resistor 2 10) Flash Tube 5 11) Transistors APHY202

  6. 17.11 The Electrocardiogram • Cell area ~ 105 m2 • Charge per surface ~ 10-8 C • Depolarization APHY202

  7. 17.11 The Electrocardiogram APHY202

  8. APHY202

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