An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :

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0.25 ms

25 ms

2.5 ms

2.5s

answer is C.

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Detailed Solution

Let say i=i0cosωt At t=0 , i=i0 Now , put i =irms=i02 ⇒i02=i0cosωt ⇒ωt=π4 ⇒t=π4ω=π42πf=1400 ⇒t=2.5ms

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