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@ -23,6 +23,8 @@ _The diagram below illustrates the flow of current where the circles are electro
![](/img/charge-cylinder.svg)
> Electrons travel very slowly through a conductor. This is in contrast to their intrinsic motion which of course equal to the speed of light (186, 000 miles per second).
## Formal expression
We measure **charge** in Coulombs ($C$). A Coulomb is an aggregate of the charge of thousands of electrons because their individual charge is so small.