A resistance of 40Ω is connected to a source of alternating current rated 220 V, 50 Hz. Find the time taken by the current to charge from its maximum value to the rms value :
A resistance of 40Ω is connected to a source of alternating current rated 220 V, 50 Hz. Find the time taken by the current to charge from its maximum value to the rms value :
Option 1 -
2.5 ms
Option 2 -
1.25 ms
Option 3 -
2.5 s
Option 4 -
0.25 s
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1 Answer
-
Correct Option - 1
Detailed Solution:Let l = l0 cos wt
l = l0, at t1 = 0
&
= 0.25 × 10-2
t2 = 2.5 ms
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