I am very confused right now about voltages. When I plug in a power supply and set it to an arbitrary voltage, I measure voltages between 0 and what I set it to. However, shouldn't it be that the closer I get to the positive terminal of the power supply, the closer the voltage gets to infinity. If V=(kq)/r then as r approaches 0, V should approach infinity; however, this is not seen. Also, why should the voltage be equal to zero at the negative pole? The negative charge is doing -work against the positive charges, so shouldn't V approach -infinity? Thanks to anyone who can clarify this for me.