Electronics - Inductors - Discussion
Discussion Forum : Inductors - Filling the Blanks (Q.No. 1)
1.
After a voltage has been applied to an inductor, the current will be ___ of its full value after 2 time constants.
Discussion:
3 comments Page 1 of 1.
Kate said:
8 years ago
Can someone please explain why is it 86%?
Priyanka said:
6 years ago
Explain it.
(1)
Historia said:
5 years ago
Since in an inductor the current increases as it reaches transient the formula is, IL=IT(1-e^(-t/T)).
t = total time.
T = time constant = L/R.
Since the problem is only concerned about the percentage, you can just use (1-e^-(t/T)).
(1-e^(-2T/T)) = 1-e^(-2) = 0.86466 = 86% thus the answer, option B.
t = total time.
T = time constant = L/R.
Since the problem is only concerned about the percentage, you can just use (1-e^-(t/T)).
(1-e^(-2T/T)) = 1-e^(-2) = 0.86466 = 86% thus the answer, option B.
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