An A C 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 :

Question

An A C 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 :, 2 . 5 ms, 25 ms, 2 . 5 s, 0 . 25 ms

MARKS App · Accepted Answer

i = i 0 cos ( ω t ) i = i 0 at t = 0 i = i 0 2 at ω t = π 4 t = π 4 ω = π 4 ( 2 π f ) = 1 8 f t = 1 400 = 2 . 5 ms

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