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!

Printable View

- Jun 1st 2009, 05:06 PMsoojin89um....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! - Jun 1st 2009, 09:49 PMalexmahone
$\displaystyle I=\frac{Q}{t}$

$\displaystyle 3.8*10^{-8}=\frac{Q}{1.8*10^{-3}}$

$\displaystyle Q=6.84*10^{-11}$ coulombs

1 coulomb=$\displaystyle 6.242*10^{18}$ electrons

$\displaystyle Q=6.84*10^{-11}*6.42*10^{18}$ electrons

$\displaystyle Q=4.27*10^8$ electrons

Your answer is right!