A 10 Ω resistance is connected across 220 V - 50Hz AC supply. The time taken by the current to change from its maximum value to the rms value is :
A 10 Ω resistance is connected across 220 V - 50Hz AC supply. The time taken by the current to change from its maximum value to the rms value is :
Option 1 -
2.5 ms
Option 2 -
4.5 ms
Option 3 -
3.0 ms
Option 4 -
1.5 ms
Asked by Shiksha User
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1 Answer
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Correct Option - 1
Detailed Solution:I = I? cosωt
Current is changing from its maximum value to rms value (I? /√2)
I? /√2 = I? cosωt
cosωt = 1/√2
ωt = π/4
2π × 50t = π/4
t = 1/400 s = 2.5 ms
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