I read that : An electric potential (also called the electric field potential or the electrostatic potential) is the amount of work needed to move a unit positive charge from a reference point to a specific point inside the field without producing any acceleration. Typically, the reference point is Earth or a point at Infinity. I dont inderstand two things :" the reference is from infinity " ? and "without producing acceleration" ? please somewone to help me to understand this. Thank you all .