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What is wattless current ?...

What is wattless current ?

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Alternating current thorugh pure L or pure C, which consumes no power for its maintenance in the circuit is called Idle current or wattless currents.
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What is meant by wattles current ?

In the series LCR circuit as shown in figure, the heat developed in 80 seconds and amplitude of wattless current is :

Knowledge Check

  • Assertion : In a purely inductive or capacitive circuit, the current is referred to as wattless currents. Reason : No power is dissipated in a purely inductive or capacitive circuit even though a current is flowing in the circuit.

    A
    If both assertion ans reason are true ans reaason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion istrue but reason is false.
    D
    If both assertion and reason are false.

  • The series combination of resistance R and inductance L is connected to an alternating source of e.m.f. e = 311 sin (100 pit) . If the value of wattless current is 0.5A and the impedance of the circuit is 311Omega , the power factor will be –

    A
    `(1)/(2)`
    B
    `(1)/(sqrt2)`
    C
    `(1)/(sqrt3)`
    D
    `(1)/(sqrt5`

  • In an a.c. circuit, the instantaneous e.m.f. and current are given by e = 100 sin 30 t i = 20 sin( 30t-(pi)/(4)) In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively :

    A
    50,0
    B
    50,10
    C
    `(1000)/(sqrt(2)),10`
    D
    `(50)/(sqrt(2)),0`

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    A circuit consisting of an inductance and a resistance joined to a 200 volt supply ( A.C.) It draws a current of 10 ampere. If the power used in the circuit is 1500 watt, then the wattless current component is

    In an AC circuit,the instantaneous e.m.f.,and current are given by E=100sin30tI=20sin(30t-(pi)/(4)) In one cycle of AC,the average power consumed by the circuit and the wattless current are respectively

    In the series L C R circuit as shown in the figure, the heat developed in 80 s is x joule and amplitude of wattless current is y ampere. Find (x y)/(100) . '(##CEN_KSR_PHY_JEE_C24_E01_019_Q09##)'

    In an a.c. circuit, the instantaneous e.m.f. and current are given by e=100sin30t I=20sin(30t-(pi)/(4)) In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively.

    The r.m.s current in an AC circuit is 2A . If the wattless current be sqrt(3)A , what is the power factor?

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