Electronic Devices and Circuits, 2nd Edition

Chapter 1

Electron Dynamics and Cathode Ray Oscilloscope

1.1   Motion of Charged Particles in Electric Fields

The subject of electronics deals with playing with electrons. Since any play involves movement, it is necessary to study the dynamics of electrons. The push-pull action of potentials (positive and negative) on electrons can be used to realise many electronic gadgets including basic electronic devices. However, the dynamics of electrons as stimulated by external fields opens its discussion under the following assumptions:

1. Electrons responsible for the conductivity do not experience mutual coulombian forces owing to the fact that charge density is very small.
2. An electron carries a mass 31 orders less than what we measure with macroscopic ...