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Thread: um....electricity? help?

  1. June 1st 2009, 05:06 PM #1
    soojin89
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    Lightbulb um....electricity? help?

    A wire etched onto a computer chip carries a current of 0.000000038 A. In 1.8 milliseconds, how many electrons flow past a point on the wire?

    i got 4.275x10^8. its wrong. please help to clearify!
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  2. June 1st 2009, 09:49 PM #2
    alexmahone
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    I=\frac{Q}{t}
    3.8*10^{-8}=\frac{Q}{1.8*10^{-3}}
    Q=6.84*10^{-11} coulombs

    1 coulomb= 6.242*10^{18} electrons

    Q=6.84*10^{-11}*6.42*10^{18} electrons
    Q=4.27*10^8 electrons
    Your answer is right!
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