Jan28 - PHYS142 Lecture 10 Capacitance and Dielectrics...

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Capacitance and Dielectrics • Chapter 26 All sections except 6 26.1 Definition of Capacitance 26.2 Calculating Capacitance 26.3 Combinations of Capacitors 26.4 Energy Stored in a Charged Capacitor 26.5 Capacitors with Dielectrics 26.7 An Atomic Description of Dielectrics PHYS142 Lecture 10 1
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Immediate application is to analyze electric circuits Circuit elements include: Batteries Capacitors Resistors Inductors Diodes Transistors ……. 2
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Electromotive force or EMF A device that transforms one type of energy to electrical energy is called a source of electromotive force or EMF . EMF is measured in Volts. Examples : * Battery ( chemical electrical) * Rotor ( mechanical electrical) * Thermocouple ( thermal electrical) * Photocell ( light electrical) 3
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Electric Battery An electric battery produces a voltage or potential difference across its terminals. Due to chemical reactions, positive charges accumulate on the positive terminal ( anode ) and negative charges accumulate on the negative terminal ( cathode ). + _ Symbol for the battery or simply anode cathode 4
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Definition of Capacitor (26.1) A pair of conducting objects (surfaces) separated by a gap constitute a capacitor . If a capacitor is connected to a battery , after a very short time each plate acquires a charge. + + + + + + _ _ _ _ _ _ V + Q - Q + 5
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difference of the battery.
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This note was uploaded on 02/22/2011 for the course PHYS 142 taught by Professor Altounian during the Spring '07 term at McGill.

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Jan28 - PHYS142 Lecture 10 Capacitance and Dielectrics...

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