03_26_Circuits

# 03_26_Circuits - Today 3/26 o a a a Capacitors Circuits Lab...

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Today 3/26 o Capacitors a Circuits a Lab questions? a HW: 3/26 “Circuits 1” Due Friday 3/28

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Capacitors Capacitance tells me how many coulombs of charge are stored in a capacitor when it has 1 Volt across it. A 25 μ F capacitor will have 25 μ C of charge on it when it has 1 volt across it. Think of capacitance as “coulombs per volt”. Units: coulombs per volt or “Farads” Equation: C = q/V
Capacitors Think of storing propane in a tank. The amount of propane depends on the pressure just as the amount of charge depends on voltage. We will use parallel plate capacitors so that all ideas from parallel plates apply. V = Ed E = σ / ε o (two plates) σ = Q/A

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Capacitors How much charge is on the capacitor? Think “6x10 -6 Coulombs per Volt and you won’t need the equation! 12 V 6 μ F 6 μ F 72x10 -6 C or 72 μ C
Capacitors What is the E-field inside the capacitor if the plates have an area of 1 m 2 ? 12 V

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## This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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03_26_Circuits - Today 3/26 o a a a Capacitors Circuits Lab...

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