17.7 Capacitance

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# 17.7 Capacitance - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about '17.7 Capacitance' - kory

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

APHY202

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

APHY202

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

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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

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

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