Defining "charge" Hello folks, My physics teacher told the class that he was eventually going to give us a pop quiz with only one question: "In one sentence, without any math, what is charge?" I think I know the answer, but since it's going to count for an entire quiz grade, it'd be nice to confirm it. Anyway, my answer is: "Charge is the difference between the total number of protons in a body and the total number of electrons in a body." Is that correct? Any suggestions for how I can improve it? One thing I can think of is that in insulators, atoms will sometimes align themselves in one direction or another in a regular fashion. Does that count as charge? Also, my answer kind of contains math, so that might be a problem. Thanks in advance.