Engineering Board Exam Reviewer · Applications: Electric Circuits and Vibrations · medium

A series RC circuit has R=1000 , C=100 F, and a 12-V source. The capacitor is initially uncharged. Find the capacitor voltage at t=0.2 s.

  1. 12 V
  2. 10.38 V
  3. 1.62 V
  4. 7.59 V

Answer

B. 10.38 V

Solution

RC=1000(100×10-6)=0.1 s. The capacitor voltage is vC=E≤ft(1-e-t/RC ). At t=0.2: vC=12(1-e-2) 10.38 V.

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