Electrical Engineering - Inductors - Discussion
Discussion Forum : Inductors - General Questions (Q.No. 19)
19.
A 320 
H coil is in series with a 3.3 k
resistor. How long does it take for current to build up to its full value?
H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?0.48 s
0.48 ms
0.48 s
s48 s
Discussion:
13 comments Page 2 of 2.
Shoaib said:
9 years ago
TIME CONSTANT AND CURRENT RELATIONSHIP:
0 0% of max current.
1Ts 63.2% of max current.
2Ts 86.5% of max current.
3Ts 95% of max current.
4Ts 98.2% of max current.
5Ts 100% of max current.
So, first we know that the maximum possible current through the circuit will be full, means the 100% of max current and the time constant will be 5Ts so,
Time constant => T= (L/R) = (320u/3.3k).
When it reaches max current(100%) it will take 5Ts.
So 5Ts = 5(320u/3.3k),
=0.48us.
0 0% of max current.
1Ts 63.2% of max current.
2Ts 86.5% of max current.
3Ts 95% of max current.
4Ts 98.2% of max current.
5Ts 100% of max current.
So, first we know that the maximum possible current through the circuit will be full, means the 100% of max current and the time constant will be 5Ts so,
Time constant => T= (L/R) = (320u/3.3k).
When it reaches max current(100%) it will take 5Ts.
So 5Ts = 5(320u/3.3k),
=0.48us.
(6)
Dhaval said:
8 years ago
Thanks @Shoaib.
Rehman said:
6 years ago
Good @Shoaib.
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