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17.7 Capacitance - PowerPoint PPT Presentation


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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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Presentation Transcript
slide1
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

slide2
17.7 Capacitance
    • For a parallel-plate capacitor:
    • Applications: cameras, computers, TVs, noise filters, starter motors, etc.

APHY202

slide3
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

slide4
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

slide5
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

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slide6
17.11 The Electrocardiogram
    • Cell area ~ 105 m2
    • Charge per surface ~ 10-8 C
    • Depolarization

APHY202