Arts and crafts

How to learn electronics from scratch

Electronics is easiest to learn with your hands — build a circuit, measure it, compare the reading with your calculation. Start with low voltage: batteries and USB power are enough for every early project. Below is a three-month plan from Ohm's law to your first microcontroller gadget.

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Safety first#

Everything in this plan runs at 12 volts or less, from batteries, USB or a ready-made certified power adapter. Mains voltage — 120 V or 230 V depending on where you live — can kill. Do not open power supplies or household appliances, and do not build anything that plugs into a wall socket until you have the experience and understand how to do it properly. Low-voltage circuits have risks too: a shorted lithium battery gets very hot and can catch fire, and a soldering iron burns. Solder in a ventilated place, keep the iron on a non-flammable stand, and wash your hands after handling solder.

Weeks 1–3: voltage, current, resistance#

Three quantities and one formula are the base for everything else. Voltage is measured in volts, current in amperes, resistance in ohms. Ohm's law ties them together: voltage equals current multiplied by resistance. Everything you need in the first weeks follows from it — which resistor to put in front of an LED, how much current will flow through a circuit, how voltage splits between resistors in series.

Buy a beginner kit: a solderless breadboard, jumper wires, resistors, LEDs, push buttons, a battery holder and a multimeter. Your first circuits are an LED with a resistor, two LEDs in series and in parallel, and a voltage divider. Calculate each circuit first, then build it and measure it with the multimeter. When the calculation and the measurement agree within a reasonable margin, the stage is done.

Weeks 4–6: components and a simulator#

Meet new parts one at a time: the capacitor (stores charge, smooths ripple), the diode (lets current through in one direction only), the transistor as a switch (a weak signal turns on a heavier load). Before you build an unfamiliar circuit, run it in an online simulator: you can see where the current flows, and nothing burns out. Learn to read schematic diagrams — write the symbols into your notes at first until you know them by sight.

Weeks 7–9: soldering#

Move one of your working circuits from the breadboard to a perfboard. Practise on scraps of wire first: a good joint is smooth and shiny, with the solder flowing around the lead rather than sitting on it as a ball. Hold the iron on the joint for a few seconds and no longer — overheating damages components and lifts the copper pads off the board.

Weeks 10–12: a microcontroller#

Arduino boards are the standard entry point into programmable electronics. They run off USB, you program them in a free development environment, and there are countless examples for them online. Start with a blinking LED, then a button, a temperature or light sensor, and printing readings to your computer. The final project is a small device that solves a problem of your own: a night light with a light sensor, a thermometer, a timer.

How to keep notes#

For every circuit you build, save the schematic, the calculation, a photo of the build and the measured results. Keep a separate page for mistakes: what did not work and why. After three months this becomes your personal reference, where every rule has been tested on your own desk.

Step-by-step plan

  1. Preparation — safety and a kitLow voltage only; breadboard, resistors, LEDs, multimeter.
  2. Weeks 1–3 — Ohm's lawLED with a resistor, series and parallel, a voltage divider; calculate, then measure.
  3. Weeks 4–6 — componentsCapacitor, diode, transistor as a switch; test circuits in a simulator, learn to read schematics.
  4. Weeks 7–9 — solderingPractise on wire scraps, then move a circuit onto a perfboard.
  5. Weeks 10–12 — a microcontrollerArduino: LED, button, sensor; a small device of your own.

Start learning this in your own space

The plan goes into your repository: tick off stages, keep notes — the change history shows how far you have come.

Start the plan

Check yourself

1.The voltage is 9 V and the resistance is 450 ohms. What current flows in the circuit, in milliamperes?

2.A current of 0.02 A flows through a 100-ohm resistor. What is the voltage across the resistor, in volts?

3.An LED runs from 5 V, drops 2 V and needs 10 mA. What resistance should the series resistor have, in ohms?

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