The $r.m.s.$ voltage of the wave form shown is

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

What is the $r.m.s$. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of $2$ amperes in the same resistor......$amp$

The current flowing through an ac circuit is given by

$I=5 \sin (120 \pi t) A$

How long will the current take to reach the peak value starting from zero?

Write the common meaning of voltage.

A $40$ $\Omega$ electric heater is connected to a$ 200 V, 50 Hz$ mains supply. The peak value of electric current flowing in the circuit is approximately......$A$