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Multi Voltage Converter
What is Voltage? Definition

Voltage is a work done between two electric conducting rod or through a conducting loop that pushes charged electrons (current) as the result, it produces such as light, etc.

Definition 2: Voltage is the electric potential difference between two points and is defined as the work done per unit charge to move a test charge between those two points.
Cube
( Electrons follows from -ve to +ve )
In simple term, voltage = pressure, and it is calculated in volts (V).