Hello, my questions are not really about an exercise or something "given". Instead, I'm having trouble understanding the concepts behind electric potential and work formulae/meaning. Maybe (probably) I missed the basics. Assume that I'm working with a puntiform charge. 1 - I've seen electric potential formulae (using the integral method) appear with and without a negative signal on the integral, and the limits were at the same position in both cases, no inverting at all: what are the differences? 2 - Why is work done by the electric field negative, and the work done by something other than the electric field positive? Wouldn't it make more sense if it was the other way around?