Student notes: Capacitance
Capacitors are electrical components used in circuits requiring timing or smoothing. They store charge, which is then released at a rate that can be controlled. First let us consider a charged metal sphere (here shown in glorious two dimensions on screen): The potential on the surface of the sphere is given by the equation: V={1\over4\pi\varepsilon_0}{Q\over r} Notice that V\propto Q . The ratio of charge to...