The power is transmitted from a power house on high voltage $ac$ because
Electric current travels faster at higher volts
It is more economical due to less power wastage
It is difficult to generate power at low voltage
Chances of stealing transmission lines are minimized
The current in the given circuit is increasing with $a$ rate $a = 4\, amp/s$. The charge on the capacitor at an instant when the current in the circuit is $2 \,amp$ will be :......$\mu\, C$
If instantaneous current is given by $i = 4\cos \,(\omega \,t + \phi )$ amperes, then the $r.m.s$. value of current is
The variation of $EMF$ with time for four types of generators are shown in the figures. Which amongst them can be called $AC$ ?
The phase difference between the voltage and the current in an ac circuit is $\pi /4$. If the frequency is $50\, Hz$ then this phase difference will be equivalent to a time of
If a direct current of $'a'$ amp is superimposed with an alternating current $'I = b\,sin \,\omega t',$ then effective value of resulting current is