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How many electrons pass through a lamp i...

How many electrons pass through a lamp in 2 minutes, if the current is 300 mA. Given that charge on an electron is `1.6 xx 10^(-19)C`.

Text Solution

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Given `t= 2 xx 60 = 120s, I = 300mA= 300 xx 10^(-3)A, n=`?
`:. n= (It)/(e ) = (300 xx 10^(-3) xx 120)/(1.6 xx 10^(-19))= 22.5 xx 10^(19)` electrons
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Knowledge Check

  • Numbers of electrons pass through lamp in one minute if current applied is 300 mA is:

    A
    `1.125xx10^(20)`
    B
    `1.125xx10^(19)`
    C
    `1.125xx10^(10)`
    D
    `1.125xx10^(36)`

  • How many electrons per second pass through a cross-section od a copper wire carrying 10^(-5)A ? (charge of 1 electron is 1.0 xx 10^(-19) coulomb ).

    A
    `1.6 xx 10^(-36)`
    B
    `1 xx 10^(+14)`
    C
    6250
    D
    62500

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