Q9 / 44 · NTA Abhyas (JEE Main) 2020 · Physics · Alternating Current

The RMS value of AC which when passed through a resistor produces heat, which is twice that produced by a steady current of 1.414 A in the same resistor is

  • Correct answer
    A
    2 A
  • B
    3.46 A
  • C
    2.818 A
  • D
    1.732 A

Solution

It is given that the amount of heat produced by AC current is twice of the amount of heat produced by DC current.

I=1.414 A

∴  Irms2⋅R=2×I2R

Irms2=2×1.4142=2×2

⇒  Irms=2 A

Hence, the correct answer is option: 'A'.

More Alternating Current Questions