lecture7 - Physics 2102 Physics 2102 Lecture 7 Lecture 7...

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Unformatted text preview: Physics 2102 Physics 2102 Lecture 7 Lecture 7 Capacitors I Capacitors I Physics 2102 Jonathan Dowling Capacitors and Capacitance Capacitors and Capacitance 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 Q = C C V where C = capacitance Units of capacitance: Farad (F) = Coulomb/Volt Capacitance Capacitance 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 Capacitors Capacitors Parallel Plate Capacitor Parallel Plate Capacitor +Q-Q E field between the plates: (Gauss Law) Relate E to potential difference V...
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lecture7 - Physics 2102 Physics 2102 Lecture 7 Lecture 7...

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