For an alternating current $I = I_0 \cos(\omega t)$,what is the $rms$ value and peak value of the current?

  • A
    $I_0, \frac{I_0}{\sqrt{2}}$
  • B
    $\frac{I_0}{\sqrt{2}}, I_0$
  • C
    $I_0, \frac{I_0}{2}$
  • D
    $2I_0, \frac{I_0}{\sqrt{2}}$

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