Capacitance

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  • Created by: Dani10
  • Created on: 01-12-15 13:23
Why is dielectric material used?
1) Increase the capacitance obtained from the given size capacitor. 2) Seperate the plates of capacitor and prevent them from touching.
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How does a dielectric act?
Reduces strength of the electric field between plates. When it is present the molecules are affected by electric field between the plates.
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What happens if a dielectric is added to a capacitor which is connected to a battery?
Extra charge to flow from the battery to maintain the p.d across the plates. Thus extra charge is stored.
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Variation of capacitance with permittivity of dielectric?
Capacitance is directly proportional to permittivity of dielectric.
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What happens when switch is closed?
It allows electrons to be drawn from +ve and deposited on the -ve plate.
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Charging of a capacitor?
When switch is first closed, no opposing potential, so large current and charge builds up rapidly on the capacitor.
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Discharging of a capacitor?
When switch is closed, electrons flow around the circuit from the -ve plate to +ve plate
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Other cards in this set

Card 2

Front

How does a dielectric act?

Back

Reduces strength of the electric field between plates. When it is present the molecules are affected by electric field between the plates.

Card 3

Front

What happens if a dielectric is added to a capacitor which is connected to a battery?

Back

Preview of the front of card 3

Card 4

Front

Variation of capacitance with permittivity of dielectric?

Back

Preview of the front of card 4

Card 5

Front

What happens when switch is closed?

Back

Preview of the front of card 5
View more cards

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