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What is meant by electric current ? Name...

What is meant by electric current ? Name and define S.I. unil In a conductor electrons are flowing from B to A. What is the direction of conventional current ? Give justification for your answer. A steady current of 1 Ampere flows through a conductor. Calculate the number of electrons that flow through any section of conductor In 1 second. (Charge on electron ` 1.6 xx 10^(-19) C) `

Text Solution

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Definition of Electric current : Refer Quick Review S.I. Unit of Current-ampere Definition of t Ampere : Refer Quick Review Direction of Current from A to B Justification: Refer to Quick Review
`I = (ne)/(t) implies n= (Ixxt)/(e)`
`=(1Axx1s)/(1.6xx10^(-19)C)=6.25xx10^(18)`
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What is meant by electric current? Name and define its SI unit. In a conductor electrons are flowing from B to A. What is the direction of conventional current? Give justification for your answer.

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Knowledge Check

  • A current of 2 ampere passes through a wire for 8 seconds. Number of electrons passing across the wire is (electronic charge 1.6 xx 10^(-19) coulomb)

    A
    `3.2 xx 10^(20)`
    B
    `1 xx 10^(20)`
    C
    `3.2 xx 10^(18)`
    D
    `1 xx 10^(18)`

  • A current of 2 ampere passes through a wire for 8 seconds . Number of electrons passing across the wire is (electronic charge 1.6 xx 10^(-19) coulomb)

    A
    `3.2 xx 10^(20)`
    B
    `1 xx 10^(20)`
    C
    `3.2 xx 10^(18)`
    D
    `1 xx 10^(18)`

  • A current of 2 A is passing through a metal wire of cross sectional area 2 xx 10^(-6) m^(-2) . If the number density of free electrons in the wire is 5 xx 10^(26) m^(-3) , the drift speed of electrons is (given e = 1.6 xx 10^(-19) C)

    A
    `(1)/(16) ms^-1`
    B
    `(1)/(40) ms^(-1)`
    C
    `(1)/(80) m s^(-1)`
    D
    `(1)/(32) ms^(-1)`

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