In an ac circuit, the r.m.s. value of current, I_rms is related to the peak current, I₀ by the relation

• A

  ${\mathrm{I}}_{\mathrm{rms}}=\frac{1}{\mathrm{\pi }}{\mathrm{I}}_0$

• B

  ${\mathrm{I}}_{\mathrm{rms}}=\frac{1}{\sqrt{2}}{\mathrm{I}}_0$

• C

  ${\mathrm{I}}_{\mathrm{rms}}=\sqrt{2}{\mathrm{I}}_0$

• D

  ${\mathrm{I}}_{\mathrm{rms}}={\mathrm{\pi I}}_0$