Digital Electronics - Multivibrators and 555 Timer - Discussion
Discussion Forum : Multivibrators and 555 Timer - General Questions (Q.No. 4)
4.
A 22-k
resistor and a 0.02-
F capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
resistor and a 0.02-F capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?Discussion:
13 comments Page 2 of 2.
Mohit Sharma said:
1 decade ago
V(c) = V(s)[1-e((-t)/RC)].
3.4 = 5[1-e((-t)/RC)].
3.4/5 = [1-e((-t)/RC)].
0.68 = 1-e((-t)/RC).
e((-t)/RC) = 0.32.
Taking natural log both sides, we have
-t/RC = -1.139.
t = 1.139 * 0.02u * 22K.
t = 0.501ms.
3.4 = 5[1-e((-t)/RC)].
3.4/5 = [1-e((-t)/RC)].
0.68 = 1-e((-t)/RC).
e((-t)/RC) = 0.32.
Taking natural log both sides, we have
-t/RC = -1.139.
t = 1.139 * 0.02u * 22K.
t = 0.501ms.
Aimal said:
1 decade ago
t = RC*ln(Vc/Vs).
Harini said:
6 years ago
How this problem is solved. Are said a formula for this problem.
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