We just started this stuff in my AP Physics class and I'm not catching on to it too quickly... At least problem solving-wise. I thought I had all the concepts down, but maybe not.

Here's a question I'm having problems with:

How do I go about this one? I'm sure it's a pretty simple problem because it's at the beginning of the chapter, but I guess I'm missing a connection or something.

Your work is a little sketchy. First of all, Joules/charge does not have units of "electrons", and I don't know what a negative number of electrons means. I get the idea of what you're doing, but you should be a lot more careful with units. Then, you seem to have forgotten the power of ten on the voltage.