Basic Electrical Components and Alternating Current is a short introductory study text on the three fundamental passive components used in electronic circuits: the resistor, the capacitor and the inductor. It explains what each component does, its unit of measurement and circuit symbol, and how resistance relates to voltage and current through Ohm's law. The notes then introduce alternating current, describing how AC voltages and currents change over time and how capacitors and inductors behave differently from resistors in AC circuits. Written in a simple lecture-note style, it is useful for students starting an electrical or electronics course and for beginners who need a quick refresher.