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# lecture17 - RC Circuits Text section 28.4 Practice Chapter...

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RC Circuits RC Circuits Text section 28.4 Practice: Chapter 28, problems 31, 37, 65, 75 Quiz Quiz 2 μF 100 k a) The switch is now closed : What is the initial current through the resistor? b) How long would it take for all the charge to leak off if the current stayed constant? + - The capacitor has an initial charge of 20 µ C.

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Result: Result: time = resistance x capacitance (the units work out to seconds). Actually, the current is not constant; as the charge decreases, the voltage decreases, so the current decreases, so charge decreases more and more slowly ... Even so, (resistance) x (capacitance) is a good first estimate of the time. Quiz Quiz a) What is the battery current immediately after the switch is closed? b) What will the charge on the capacitor be a long time after the switch is closed? c) How long is “a long time”? The capacitor has zero initial charge. 2 μF 100 k + - 10 V
Demonstration 0.3 F 9 V to voltmeter Discharging a Capacitor Discharging a Capacitor C R q -q I Given: R, C, q o (initial charge) Find: q(t) and I(t) dt dq R C

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