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CAPACITOR AND DIELECTRICS
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CAPACITOR AND DIELECTRICS
2.1 CAPACITOR
Circuit symbol for capacitor:
- Device that can store charges.
- Come in different shapes & sizes.
- Used in a variety of electric circuits.
- Consists of 2 conductors separated by a small air gap or insulator.
Capacitance (C)
Q: charge on one of the plates
V: potential difference across them
- It does not change unless it is designed to be a variable capacitor.
- Capacitor that has > capacitance can hold more charges than one with < capacitance for same potential difference applied.
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2.5 DIELECTRIC
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Purposes of dielectric:
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Limit the potential difference, Vmax called breakdown potential.
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To increase the capacitance by a factor of қ.
(Increase the charge storage capacity of the capacitor)