Question

The peak voltage of an ac supply is $300V$. What is the rms voltage?

Answer 1

Denote peak voltage as $V_0$

then $rms$ voltage is $V_0$ $divided$ $by$ $\sqrt[2]{22}$

so $V_{rms}=\frac{300}{1.414}=212.16V$

As $\sqrt[2]{22}=1.414$