When you are told that V is the voltage at a given point in an electric field and voltage is the difference in potential energy between two points/charge, where is the other point supposed to be? Thanks
Consider the electric field between two charged electrodes placed 1 meter apart. One is negatively charged, the other is positive. A positive charge is placed near the positive electrode (Point A) and another is placed midway between the electrodes (Point B). Both will accelerate towards the negative electrode (Point C), with the charge at point A gaining more energy before it hits the negative electrode than the charge placed at point B. So we can say that a charge placed at point A has more potential energy than one placed at point B. Since voltage is a difference in electric potential, point A has a greater voltage than point B, when both points are referenced to point C.I also don't quite understand what is meant by voltage is a property of the field or that it is position dependent.
In an electric circuit, the reference is usually taken to be Earth (an actual connection to the Earth) or a local 'Ground', which is designated to be Zero Potential. This, latter, is arbitrary. Engineers can be sloppy in this regard and tend to take this for granted but, when dealing with small Voltages, it can be very relevant.When you are told that V is the voltage at a given point in an electric field and voltage is the difference in potential energy between two points/charge, where is the other point supposed to be? Thanks