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Q: What is meant by saying that the potential difference between two points is 1v?
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What happens to the voltage as the number of flowing electrons increases?

Voltage is the potential difference between two points. It is commonly measured by a voltmeter with 2 probes, each one touching the two points. Flowing electrons do not depend on voltage. They depend on the voltage difference between two points. Same as saying a ball does not run along a road merely if the road is at high altitude. Only if the altitude is falling along the road will the ball run in that direction. And the steeper the road, the faster it goes. The currents that flow in a wire is not directly caused by increases in the number of electrons (in a metal, the concentration of electrons is constant at all normal voltages and doesn't vary with current) but how rapidly the voltage changes as you go along the wire ("the electric field", measured in volts per cm). If you force in more flowing electrons from a source connected to it, the volts per cm increases so that the current carries away the supplied flow.


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What is voltage potential betweei positive to earth?

By saying 'positive', you appear to be describing a d.c. system. In which case it depends entirely on the potential difference of the source and how it is earthed. If you are describing an a.c. system, then you presumably mean 'line', rather than 'positive', then -again- it depends on the potential difference of the source and how it is earthed -e.g. in the UK, the potential of the line, measured with respect to earth, should be close to the nominal value of 230 V.Incidentally, there is no such thing as 'voltage potential'. 'Voltage' is synonymous with 'potential difference', not'potential'. So, when you say 'voltage potential', it's the same as saying 'potential difference potential' which, I think you will agree, doesn't make any sense!


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