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# Compute for t. When will the capacitor be fully charged?

What is the voltage across the capacitor after 5 seconds? The discharging voltage across the capacitor, Vc , at any instant time during the discharging period in given as:

Vc = Vs e-t/RC

R=100k

Vc=10v

C=22uf

3. Given the circuit below

R=100k

Vc=10v

C=22uf

Vc = Vs (1 – e-t/RC )

Compute for t. When will the capacitor be fully charged? What is the voltage across the capacitor after 5 seconds? The discharging voltage across the capacitor, Vc , at any instant time during the discharging period in given as:

Vc = Vs e-t/RC

Where

Vs is the voltage supply

R is the resistance in ohm

C is the capacitance in Farad

t is the time elapsed since the application of supply

### 3 Answers

- JullyWumLv 78 years agoFavorite Answer
The supply voltage (Vs) is still required (the original voltage on the capacitor) .. is it in a previous part of the your question?

- 8 years ago
Yea it's not clear you seem to be missing information and to answer it you would have to ASSUME certain facts that are missing.

The circuit is not described

The source voltage is not given

Your given formula is not written correctly

Is it charging or discharging? Your question asks when will it be fully charged? It will be considered fully charged after 5 time constants with 2.2s per tc. 5x2.2=11s

- oldschoolLv 78 years ago
The question is not clear. Please rephrase. Copy the question as asked from the book or from the instructor.