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This chapter shows where actual use of electrostatic analysis is involved in actual structures. It begins with a section on basic circuit theory, because this is a discipline based on electrostatic (and magnetostatic) approximations whose use is implied in the functioning of the various structures. The chapter provides a brief introduction to transmission line theory that is presented in handbook format, with only the necessary equations, with no supporting derivations. Although vacuum tubes and cathode ray tubes have been phased out by solid-state devices, some electron beam devices, such as the scanning electron microscope (SEM), remain in use. A very high electric field can be obtained by the combination of a very sharp thin tip of metal and the use of high potentials.