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The following pages are meant for those who wish to use thyristors. Thyristors are used so much in connection with the control of machines that it is worthwhile to go into some details of both the electric drive to be controlled and the possible thyristor control units.

Chapter 3 deals with statistical mechanics in some detail, so that the reader can appreciate the historical background leading to the Fermi Dirac statistics for electrons in metals and semiconductors, and in chapter 4 these statistics are applied to determine the current carrier density in various types of semiconductor.