Voltage is a force that makes electricity move through a wire. It is measured in volts. Voltage is also called electric tension or electromotive force (EMF). It was named after Alessandro Volta.
Technically, the voltage is the difference in electric potential between two points. Voltage is always measured between two points, for example between the positive and negative ends of a battery, or between a wire and ground.
As seen in volt Hydraulic analogy, voltage can be seen as the pressure on the electrons to move out of the source. It is directly proportional to the pressure exerted on the electrons. In other words, the higher the voltage, the higher the pressure. For example, a battery of 3 volts will exert pressure on the electrons twice as hard as a battery of 1.5 volts.
The voltage can push the electrons into a component, like a resistor, creating a current. Usually, the voltage and the current are related by a formula.

License information: CC BY-SA 3.0 and GFDL
MPAA: G
Go to source: https://simple.wikipedia.org/wiki/Voltage