How Electrical Engineering Works: The Beginner's Guide to Circuits and Systems: From Ohm's Law to PCB Design – Learn by Doing

The book begins with the foundational concepts of electricity, explaining how atoms, electrons, and electric current work. It covers Ohm’s Law in depth—the golden rule of circuits—with practical examples and calculations. Readers learn about power, energy consumption, and how to apply these principles in real-world scenarios. The guide then explores essential electronic components: resistors for controlling current, capacitors for storing electrical energy, inductors for dealing with magnetic fields, diodes as one-way valves for electricity, and transistors as switches and amplifiers.

Practical circuit configurations are explained through series and parallel connections, with detailed comparisons of when to use each. Hands-on chapters cover how to use a breadboard for prototyping, reading schematics, and troubleshooting circuits with a multimeter. The book introduces sensors for measuring temperature, light, and motion, along with digital logic fundamentals including AND, OR, and NOT gates. Readers learn to interface with buttons, displays, and motors, building interactive projects step by step.

A significant portion of the book focuses on microcontroller programming with Arduino, from basic setup and programming to advanced sensor integration and wireless communication. The guide then transitions to PCB design, covering what printed circuit boards are, how to use free design software like EasyEDA and KiCad, and how to order professional-quality boards online affordably. Troubleshooting chapters equip readers with diagnostic skills for fixing common electrical problems in circuits and devices.

Key Topics Covered:

• Electricity Basics: Atoms, electrons, conductors, insulators, AC vs. DC current.

• Ohm’s Law: Voltage, current, resistance relationships with practical calculations.

• Power and Energy: Wattage, power dissipation, battery life estimation, and household electricity.

• Resistors: Types, color codes, series and parallel combinations, voltage dividers, and power ratings.

• Capacitors: Energy storage, filtering, timing circuits, and types (electrolytic, ceramic, supercapacitors).

• Inductors: Magnetic fields, inductance, transformers, power supplies, and filters.

• Diodes: Rectification, LEDs, Zener diodes, Schottky diodes, and photodiodes.

• Transistors: BJT and MOSFET operation, amplification, switching, and biasing.

• Series vs. Parallel Circuits: Voltage and current distribution, power considerations, and reliability.

• Breadboard Prototyping: Layout, wiring techniques, and troubleshooting common mistakes.

• Reading Schematics: Symbols, power distribution, signal flow, and component labeling.

• Sensors: Temperature (thermistors, thermocouples), light (photoresistors, photodiodes), and motion (PIR, ultrasonic, accelerometers).

• Digital Logic: AND, OR, NOT, NAND, NOR gates, truth tables, and Boolean algebra.

• Arduino Programming: Setup, digital/analog I/O, libraries, serial communication, and projects.

• Interfacing: Buttons, LEDs, LCD displays, stepper motors, DC motors, servos, and wireless modules.

• PCB Design: Manufacturing process, trace routing, vias, solder mask, silkscreen, and design rules.

• PCB Software: EasyEDA and KiCad for schematic capture and board layout.

• PCB Ordering: Fabrication services, panelization, assembly options, and shipping.

• Multimeter Use: Voltage, current, resistance, continuity, capacitance, and diode testing.

• Troubleshooting: Power failures, intermittent issues, overheating, component failures, and water damage.

• Building Projects: Adjustable power supply design, testing, and enhancement.