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......$amp$
$6$
$2$
$3.46$
$0.66$
Explain electrical energy when an ac current passes through a resistor.
The alternating current is given by
${i}=\left\{\sqrt{42} \sin \left(\frac{2 \pi}{{T}} {t}\right)+10\right\} {A}$
The $r.m.s.$ value of this current is ${A}$
The voltage of $AC$ source varies with time according to the equation, $V = 100\, \sin 100\, \pi \, t \, \cos \,100\, \pi \,t$. Where $t$ is in second and $V$ is in volt. Then:-
What are $A.C.$ signals ?
The alternating current in a circuit is described by the graph shown in figure. Show rms current in this graph.