Question

·       Consider a circuit having 30V source, switch,  resistance R,  capacitor 0.01 micro farad and resistance 10 kilo ohm connected in series.  When the switch in this circuit is closed, the voltage across the capacitor must rise to 6.59 V in 0.1 ms.  Identify the value of R that should be used.

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Answer 1

Answer:

In a RC-series circuit excited by a DC source, at steady state, no current flows. So, all the voltage drop is across the capacitor. Therefore, the voltage drop will be 60 V. 

The formula is V=V0(1−eRC−t).