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lecture9 - 1 Physics 2102 Gabriela Gonzlez Capacitor: any...

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Unformatted text preview: 1 Physics 2102 Gabriela Gonzlez Capacitor: any two conductors, one with charge + Q , other with charge - Q +Q -Q Uses: storing and releasing electric charge/energy. Most electronic capacitors: micro-Farads ( F), pico-Farads (pF) -- 10-12 F New technology: compact 1 F capacitors Potential DIFFERENCE between conductors = V Units of capacitance: Farad (F) = Coulomb/Volt 2 Capacitance depends only on GEOMETRICAL factors and on the MATERIAL that separates the two conductors e.g. Area of conductors, separation, whether the space in between is filled with air, plastic, etc. +Q -Q (We first focus on capacitors where gap is filled by AIR!) Electrolytic (1940-70) Electrolytic (new) Paper (1940-70) Tantalum (1980 on) Ceramic (1930 on) Mica (1930-50 Variable air, mica 2 Capacitance depends only on GEOMETRICAL factors and on the MATERIAL that separates the two conductors e.g. Area of conductors, separation, whether the space in between is filled with air, plastic, etc. +Q -Q (We first focus on capacitors where gap is filled by AIR!) Electrolytic (1940-70) Electrolytic (new) Paper (1940-70) Tantalum (1980 on) Ceramic (1930 on) Mica (1930-50 Variable air, mica 3 Capacitor: any two conductors, one with charge + Q , other with charge Q +Q Uses: storing and releasing electric charge/energy. Most electronic capacitors: micro-Farads ( F), pico-Farads (pF) -- 10-12 F New technology: compact 1 F capacitors Potential DIFFERENCE between conductors = V Units of capacitance: Farad (F) = Coulomb/Volt -Q +Q -Q What is the capacitance C? Area of each plate = A Separation = d charge/area = = Q/A Relate E to potential difference V: E field between the plates: (Gauss Law) We want capacitance : C=Q/V 4 A huge parallel plate capacitor consists of two square metal plates of side 50 cm, separated by an air gap of 1 mm What is the capacitance?...
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lecture9 - 1 Physics 2102 Gabriela Gonzlez Capacitor: any...

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