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
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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