Imagine that in you decided to spend your next week-end in himalaya mountains (it's very cold there ,is't it ? ) with your friends and an Avalanche is occurred (ohhh action film) , have you asked your self why this ball of ice take its way to the earth , of course it have a potential energy resulted from height due to gravitational force .
The same thing happened in electronics , free electrons moves in high speed resulting beam ogf electrons (current) due to potential difference but this potential differ is't for height it's for positive ions (holes) , in other word in region there are a lot of electrons and another there are low no. of electrons . free electrons moves from regions fulled with free electrons to low one , this is so-called Voltage or potential difference (really it's natural laws , isn't it ) .
In other hand , you can say that the voltage is the pressure needed to move electrons from one point to another , and also we can say that current is a result from difference in potential (voltage) .
Finally , voltage is needed , current is resulted , but we forget to say that voltage can be measured by a unit called "volt" (it is named in honor of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile ) .
Really now we can call voltage by voltage or electrical potential difference or electro-motive force .
Note plz don't forget to watch videos in my blog about this principles Click Here , Pling heheheh
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