Q: I am reading up on voltage and I want to make sure I am understanding this concept correctly. We say that there is a voltage between two points a and b. Then if I am to put a particle of any charge at point a, and multiply the charge by the voltage, I will obtain the potential energy at point a. Similarly, I will obtain the potential energy at point b. If I subtract the potential energy at point a minus the potential energy at point b, then I will know how much work it will take for me to move that particle of charge from point a to point b. Is this correct? The work in moving from a to b would be, [tex]W_a_-_>_b = (V_a * q - V_b *q) [/tex], where q is any charge I pick.