EE 3320 Lecture : Notes 1
Document Summary
A voltage as a function of time may be written as ( )tv. This is an example of a function of one variable. In electromagnetics this, as well as other quantities of interest, are also often functions of time and space. In the cartesian coordinate system we might write v . The fact that this quantity is now a function of three dimensional space makes this a field. The fact that this quantity is a scalar (there is no direction associated with it) as opposed to a vector, makes this a scalar field. Another good example of a scalar field is the temperature at different locations in this room. Since vector quantities are often of interest in physics and engineering (force, velocity, momentum, current density, electric and magnetic fields, etc. Choosing the symbol e electric field which is a vector quantity with both a magnitude and direction.
