Question

voltage are always measured between two points why?​

Answer 1

Answer:

Because it is the definition of voltage. You may measure the electrical potential of a point. Voltage is defined as “the difference in electrical potential between two points”. It tells you what direction current will flow and how strong the current will be.

Answer 2

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The potential difference between two points ΔV is often called the voltage and is given by ΔV=VB−VA=ΔPEq Δ V = V B − V A = Δ PE q . The potential at an infinite distance is often taken to be zero. The case of the electric potential generated by a point charge is important because it is a case that is often encountered.