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Home Q & A Board Science-Related Homework Help Physics
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Fiah Fiah
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11 years ago
After the Capacitor is charged up, and the charges are all in equilibrium, I discharge the Capacitor. Why does the voltages of both the resistor and capacitor go down to zero, and the current goes to negative and then goes back up to zero?

Thanks! I have a lab on this tomorrow!
The circuit is just a battery, resistor, and capacitor in series. There are two switches, one to charge the capacitor and one to discharge it.
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#1
11 years ago
i believe this is Kirchhoff's current law.
wikipedia has some info on it.

with these circuit problems, i find that the best way to understand it is mathematically. try to find an equation that relates the variable you are looking to study and analyze it that way.
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#2
11 years ago
The reversal of current is of course the capacitor giving up it's charge. Once discharged, the current returns to zero, since there is no charging current available from the short circuit.
wrote...
#3
11 years ago
I would need to see the circuit. In a simple RC with battery and switch, the voltage should never go negative, but that depends on your reference.

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