# Capacitor problems

**SPQR.**

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**A 12µF capacitor is connected by a switch to a 100 volt DC supply via a 20Ω resistor. Assume the capacitor is initially uncharged. Calculate:**

**a. ****The TIME constant**

**b. ****The INITIAL current at the moment of closing the switch**

**c. ****The TIME for the current to fall to 3 amps**

**d. ****The TIME for the voltage of the fully charged capacitor to fall to 70 volts. (The capacitor is discharged through a 20 Ω resistor)**

**e. ****Sketch the growth of voltage across the capacitor against time**

- 7 years ago

**A++ and top quality answers (Updated on 28 July 2014)**

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- capacitor_solutions.docx