PPE18_Capacitance

# PPE18_Capacitance - © RHJansen Potential Potential...

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Unformatted text preview: © RHJansen Potential Potential Capacitance and Capacitance and Capacitors Capacitors Capacitor © RHJansen Two plates with opposite charge. Capacitors store charge and energy . Capacitance C The capacity of a capacitor to store charge. C Capacitance measured in Farads, F κ Dielectric constant of the material between the plates (table) Permittivity of free space A Area of one plate (both same) m 2 d Distance between plates m C = κ Α δ Dielectric © RHJansen To prevent charges from moving between the plates capacitors are constructed with an insulator between the plate. Insulators have a varying degree of effectiveness and this is reflected in the dielectric constant κ . When learning about capacitors we often begin with two plates separated by a vacuum or air The dielectric constant of a vacuum is κ = 1 . The dielectric constant of air is extremely close to κ = 1 . This simplifies the previous equation to If a problem does not mention a dielectric, assume the simplest case, κ = 1, and use the above simplified equation....
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PPE18_Capacitance - © RHJansen Potential Potential...

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