Ch16_part2

# Ch16_part2 - Chapter 16 Part 2 PHY213 lecture 5 Capacitance...

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Chapter 16, Part 2 PHY213, lecture 5 1 Capacitance s A capacitor is a device used in a variety of electric circuits s The capacitance , C, of a capacitor is defined as the ratio of the magnitude of the charge on either conductor (plate) to the magnitude of the potential difference between the conductors (plates) Capacitance, cont s s Units: Farad (F) s 1 F = 1 C / V s A Farad is very large s Often will see µF or pF V Q C Parallel-Plate Capacitor s The capacitance of a device depends on the geometric arrangement of the conductors s For a parallel-plate capacitor whose plates are separated by air: d A C o ε = Parallel-Plate Capacitor, Example s The capacitor consists of two parallel plates s Each have area A s They are separated by a distance d s The plates carry equal and opposite charges s When connected to the battery, charge is pulled off one plate and transferred to the other plate s The transfer stops when V cap = V battery

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Chapter 16, Part 2 PHY213, lecture 5 2 Electric Field in a Parallel- Plate Capacitor s The electric field between the plates is uniform s Near the center s Nonuniform near the edges s The field may be taken as constant throughout the region between the plates Capacitors in Circuits s A circuit is a collection of objects usually containing a source of electrical energy (such as a battery) connected to elements that convert electrical energy to
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Ch16_part2 - Chapter 16 Part 2 PHY213 lecture 5 Capacitance...

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