This book develops a consistent macroscopic theory of electromagnetism and discusses the relation between circuit theory and field theory. The theory is developed in successive steps from the Lorentz force, the integral form of Maxwell's equations in free space, and suitable macroscopic models of polarized and magnetized matter.Special features- Covers the electromagnetism of moving bodies and the process of electromechanical energy conversion- Introduces a power-series technique for analyzing quasi-static fields and quasi-stationary systems- Emphasizes the synthesis of fields as opposed to the analysis of fields- Presents, in an appendix, the four-dimensional relativistic formulation of macroscopic electrodynamics recently developed by one of the authors (L. J. Chu)