EE 201 Circuits G. Tuttle

RC transients practice problems
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Read the RC-transient class notes.


For the circuit shown,

  • R = 1.5 kΩ
  • C = 15 μF
  • VS = 4 V

For the RC circuit, the switch has been open for a long time and closes at t = 0. Prior to the switch closing, the capacitor was charged to a voltage of Vi = -10 V.

Determine the expression for the capacitor voltage as a function of time, for t > 0.

Calculate the time when the capacitor voltage will be equal to 0.5 V and calculate the capacitor current at that time.

Answer