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# lec7 - ENGR 111 Lecture 7 Reading Chapters 20,21,30 Class...

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ENGR 111 Lecture 7 Reading: Chapters 20,21,30 Class notes

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Fall 2004 Capacitance z Two conducting plates, separated by an insulator z Can’t pass through current continuously, but current can pass for a short time { Current charges one plate, equal, opposite charge builds on the other plate, allowing current to pass z Q = CV, I = dQ/dt = C dV/dt
Fall 2004 Capacitance – Water Analogy z As water enters one end – compresses the spring, exerting pressure on other end z Amount of water entering one side equals leaving on other side

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Fall 2004 RC Circuits z RC product determines the behavior z RC = time constant z Within RC time units, current is 1/e of initial current etc…