This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
There is a DC battery or AC power supply, then there is a resistance R and a capacitor  which are all connected in series.
  There ma y be a switch to close the circuit at t = 0.

the time constant for charging or  discharging the capacitor = RC.
After the capacitor gets charged quickly to the voltage of the dc supply, there is no more current in the circuit.

for AC circuit, the capacitor continuously charges and discharges.  there is heat dissipation in the resistance.

1 5 1