An A C source rated 220   V , 50   Hz is connected to a resistor. The time taken by the current to…

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 :
  1. 2.5 ms
  2. 25 ms
  3. 2.5 s
  4. 0.25 ms

Solution

i=i0cos(ωt)
i=i0 at t=0
i=i02 at ωt=π4
t=π4ω=π4(2πf)=18f
t=1400=2.5 ms

Asked in: JEE Main 2021 (18 Mar Shift 1)

Practice more Alternating Current questions on Aicharya