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Electrical Technology, Volume 1 by S. P. Bali

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2

Electrons in Action

OBJECTIVES

In this chapter you will learn about:

  • Conduction in solids
  • Energy bands and energy levels
  • Effect of an electric field on energy levels
  • Resistivity of conductors, semiconductors and insulators
  • Bonds in atoms—metallic, ionic, and covalent
  • Electrons in action—the electric current
  • Direction of current flow—conventional, electron, ionic, and diffusion
  • The effects of electricity
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2.1  INTRODUCTION

Electrical engineering itself can be described as a study of the movement of electrons. For a current to flow within a medium, the presence of charge carriers is necessary, and these charge carriers must be mobile. In ...

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