The key is closed.
2nd law of commutation.

Uc = Us mouth + Uc cv
Uc mouth = E

τ = RC - characterizes the speed of the transition process. The transition process will end in about (3 ÷ 5) τ. Unlike the voltage, the current on the capacitor changes abruptly.

The key is open


the current in the RC circuit is limited only by the resistance.
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Electrical Engineering, Circuit design
Terms: Electrical Engineering, Circuit design