This document provides an overview of basic electronics concepts including: - What electricity is made of atoms and how electrons flow to create current. Voltage is defined as the difference in electric potential needed to push electrons through a circuit. - Components like resistors, capacitors, inductors and their functions. Ohm's Law defines the relationship between voltage, current and resistance. - Semiconductors like diodes and transistors are explained. Diodes only allow current to flow in one direction while transistors can be used as electronic switches or amplifiers. - Common electronic devices are introduced along with exercises to apply the concepts. The document serves to introduce fundamental building blocks of electronics.