ABSTRACT
Mankind has known about the existence of electricity for thousands of years but, for most of that time, electricity was regarded as either something to be feare, or simply as a curiosity – with its various phenomena regarded for the curious. This chapter examines Bohr's model of the atom and the part electrons play as charge carriers in metal conductors. Bohr's model of the atom consists of a nucleus, surrounded by up to seven orbits called electron shells. The amount of negative charge on one electron is identical to the amount of positive charge on one proton. The quantity of free electrons that drift through a metallic conductor, per unit time, is termed an electric current, and is expressed in amperes. A 'displacement current', then, is associated with insulators, and is a 'momentary' current due to the distortion of the fixed atoms' electron orbits under the influence of external electric charges.
