In a series $LCR$ circuit,an alternating emf $(v)$ and current $(i)$ are given by the equations $v = v_{0} \sin \omega t$ and $i = i_{0} \sin \left(\omega t + \frac{\pi}{3}\right)$. The average power dissipated in the circuit over a cycle of $AC$ is:

  • A
    $ \frac{v_{0} i_{0}}{2} $
  • B
    $ \frac{v_{0} i_{0}}{4} $
  • C
    $ \frac{\sqrt{3}}{2} v_{0} i_{0} $
  • D
    Zero

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$(a)$ For circuits used for transporting electric power, a low power factor implies large power loss in transmission. Explain.
$(b)$ Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit. Explain.

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In an $a.c.$ circuit,the voltage applied is $E = E_o \sin \omega t$. The resulting current in the circuit is $I = I_o \sin \left( \omega t - \frac{\pi}{2} \right)$. The power consumption in the circuit is given by:

In the circuit shown in the figure,if the value of $rms$ current is $2.2\, A$,the power factor of the box is:

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For circuits used for transporting electric power,a low power factor implies . . . . . . .

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