Define 'voltage' and 'current'



5 years ago Comment

Best answer

"Voltage" is the difference in electrostatic potential between two points.
It's the "pressure" that makes the electrons want to run from one point
to another. More voltage ==> more 'pressure' ==> the negative electrons
are more strongly repelled by the negative terminal and more strongly
attracted to the positive one.

"Current" = the rate at which electrons flow along the path.
I don't mean their physical speed. I mean how many electrons
pass by a mark every second.
If (6.25 x 10¹⁸) electrons pass a point on the wire every second,
that's called 1 Ampere ( 1 'amp') of current.
If (1.25 x 10¹⁹) of them do, then that's 2 Amps of current, etc.

You might be thinking that the current between 2 points depends on
the voltage between them, and if you double the voltage between two
points then the current would automatically double, because twice as
many electrons would become obsessed with the desire to flow from one
point to the other.  If that's what you're thinking, you are totally correct.


5 years ago Comment

current,I:rate of flow of electric charge(may be electron) through a conductor
voltage,V:potential difference across the cell in a circuit
       (ohm's law) V=IR