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Electric current, Electrical Engineering
Electric current
Electric current is a flow of electrons. Each electron carries a very small amount of negative charge (1.6 x 10
^{19 }
coulombs)
A current of 1 amp at a point in a circuit is the flow of 1 coulomb of charge per second flowing past that point. This means that approx 6 x 10
^{18}
electrons must pass the point every second. This is a huge number.
Electrons circulate continuously round a circuit being pumped round by a power source.
If more than one route round the circuit is available then the electron flow will divide (in some ratio) between the available routes.
Electrons will not be lost  all those that emerge from the power source will eventually return to it.
To pump the current through any resistors in the circuit requires a voltage to be developed across them (think of it as a pressure difference required to push a fluid through a restriction)
Posted Date: 8/20/2012 11:42:01 PM  Location : United States
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