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I am a newbie at electronics and I want to ask when the capacitor is fully charged why the current is stopped.

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  • \$\begingroup\$ flow into your car's gas tank stops when the nozzle clicks because the tank is full; how would anything flow into a full tank? \$\endgroup\$
    – dandavis
    Commented Nov 18, 2023 at 21:34

2 Answers 2

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When there's a potential difference between two nodes there's a current flow. The amount of current is set by the resistance across these nodes.

When there's no potential difference, no current flows.

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  • \$\begingroup\$ if I want to discharge the capacitor, what should i do? \$\endgroup\$ Commented Nov 18, 2023 at 14:15
  • \$\begingroup\$ @ElectroNoob you need to create a discharge path i.e. a resistor (or load, in general) connects to a lower potential. Practically, if you cut the battery connection and connect a resistor across the capacitor it's going to be enough. \$\endgroup\$ Commented Nov 18, 2023 at 14:18
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It is the nature of the capacitor. There can be current through the capacitor only if the voltage across it is changing.

The defining equation is:

$$i_C=C\frac{dv_C}{dt}$$

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  • \$\begingroup\$ oh I see, thanks for the answer \$\endgroup\$ Commented Nov 18, 2023 at 14:30

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