You'll excuse me for putting such a basic question here, but my high-school exam is tomorrow and I just want to make sure I have things straight! (I'm not very worried here..) The constant is 9.0* 10^9 right? (nm the units) 1: Current is charge per second (*speed?) (the amount of electrons passing through per second). The reason resistance lowers current is it slows down the electrons (thus the "per second") 2: Voltage is basicly potential gravity. constant*charge1*charge2/distance. 3: R=IV, (series) R = R+R... , I=I=I, V=V+V, (parralel), 1/R = 1/R + 1/R.., I = I+I, V=V=V 4: Magnetic fields. The force around a wire is constant*current/distance (more current means more force, more distance means less force, distance to power 1 since it's a cylinder and not a sphere) 5: Charges are exactly like gravity, except with the possibility of a repulsion. (kinoof 2, here) 6: The equation for the magnetic field between two plates is: Field = Voltage/Distance (between plates). The field is uniform across the entire area. uhm... (keeps thinking...) I think that's all. I wish I still had my physics book and I didn't have to "study from memory" (you know, go over it so you don't need to spend that downtiem during the exam).