Hot wire ammeters are used for measuring

An alternating current in a circuit is given by $I = 20 \sin (100 \pi t + 0.05 \pi) \ A$. The r.m.s. value and the frequency of the current respectively are:

$A$ resistance of $20 \Omega$ is connected to a source of an alternating potential $V = 200 \sin (10 \pi t)$. If $t$ is the time taken by the current to change from the peak value to rms value,then $t$ is (in seconds).

What are $A.C.$ signals?

$A$ current in a circuit is given by $i = 3 + 4 \sin \omega t$. Then the effective value ($RMS$ value) of the current is:

If the rms current in a $50 \text{ Hz}$ $AC$ circuit is $5 \text{ A}$,and at time $t=0$,the current $I$ is $0$. The value of current $I$ at $t=\frac{1}{300} \text{ s}$ is . . . . . . $A$.