The $AC$ voltage across a resistance can be measured using a

The ratio of peak value and r.m.s value of an alternating current is

The output sinusoidal current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is

Match the following

Currents                                     $r.m.s.$ values

(1)${x_0}\sin \omega \,t$                               (i)$ x_0$

(2)${x_0}\sin \omega \,t\cos \omega \,t$                  (ii)$\frac{{{x_0}}}{{\sqrt 2 }}$

(3)${x_0}\sin \omega \,t + {x_0}\cos \omega \,t$        (iii) $\frac{{{x_0}}}{{(2\sqrt 2 )}}$

Explain electrical energy when an ac current passes through a resistor. 

An alternating voltage is represented as $E = 20\,sin \,300t.$ The average value of voltage over one cycle will be.......$V$