S13Phys2BaLec25A

# Capacitance is the ability to hold charge the more

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Capacitance is the ability to hold charge. The more capacitance something has the more capacity it has to hold charge. What is a capacitor? A capacitor is a device that stores charge when it is subjected to a potential difference. What does a capacitor physically look like? Although we represent most capacitors as two parallel plates, capacitors have a variety of shapes.

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Capacitance
Capacitors Capacitance, C, is a measure of how much charge can be stored for a capacitor with a given electric potential difference. Where Q is the amount of charge on each plate (+Q on one, –Q on the other). Capacitance is measured in Farads. [Farad] = [Coulomb]/[Volt] A Farad is a very large unit. Most things that you see are measured in μ F or nF.

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Capacitor Construction Area A Spacing d Parallel metal plates (air)
C 2 N·m 2 8.85 -12 × 10 [F] = [m] [m 2 ] C = d A Capacitance (1) J C 2 ε o

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Capacitors “Capacitors” (Source: Windell Oskay)
“CP32248-50_EA.jpg” (Source: Sargent-Welch, VWR International) 1.0 F!

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“MAKE presents: The Capacitor” (Source: makemagazine) Teardown
Capacitor Charging Potential difference V ± Q charge + + + +

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[V = J/C] [C] C = V Q Capacitance (2) C : Given V, C : more Q stored less Q stored C : Given Q, C : less V needed more V needed [F] = J C 2
“Capacitor explosion from excessive voltage” (Source: Gerald Walker, aka WallerMedia) Overloaded Exercise Care When Handling Capacitors

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Camera flash “Flash unit par 2” (Source: nakú)
Computer Keyboards “Capacitor Applications” (Source: Thomson-Brooks Cole) Serway & Jewett, Principles of Physics

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