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Learn Electronics

Go from blinking your first LED to designing circuits that work.

Free to start. Built from a single prompt. No credit card.

Electronics is the craft and science of controlling electric current with components such as resistors, capacitors, diodes and transistors. A few laws, Ohm's law and Kirchhoff's laws, explain most beginner circuits, and you learn fastest by building them on a solderless breadboard and measuring with a multimeter. Start with low-voltage battery projects, move to timing circuits and transistor switches, then to digital logic and microcontrollers. Learnr builds a personalized electronics course from a single prompt and pairs short lessons with hands-on practice, with basic safety covered from the start.

How to learn Electronics, step by step

Learn the three core quantities and safety rules. Understand voltage as push, current as flow and resistance as opposition. Stay with batteries and low-voltage USB supplies, never open mains-powered devices, and remember that large capacitors can hold a dangerous charge after power is removed.
Set up a breadboard and multimeter. Get a starter kit with a breadboard, jumper wires, resistors, LEDs, a battery holder and a basic multimeter. Learn which breadboard holes are connected and how to read resistor color codes before you build anything.
Build an LED circuit with Ohm's law. Calculate the current-limiting resistor: supply voltage minus the LED forward voltage, divided by the current. For 9 volts, a 2 volt LED and 20 milliamps that is 350 ohms, so use the next standard value up, 390 ohms.
Master series, parallel and the voltage divider. Measure voltage across components and current in series with the circuit, then confirm Kirchhoff's voltage and current laws with your meter. Build a voltage divider and use a potentiometer to see the output change smoothly.
Add capacitors and transistors. Watch an RC circuit charge with a time constant of R times C, then build a 555 timer blinker. Use an NPN transistor as a switch with a base resistor, and add a flyback diode across any motor or relay coil.
Learn to solder safely, then program a microcontroller. Solder in a ventilated space, use a stand for the hot iron and wash your hands after handling solder. Then read sensors and drive outputs with a microcontroller board, reviewing concepts daily with short Learnr lessons.

What you'll learn

Apply Ohm's law and Kirchhoff's laws to series and parallel circuits
Read a schematic and build it correctly on a breadboard
Measure voltage, current and resistance with a multimeter
Use diodes, LEDs and transistors as switches in real circuits
Explain capacitors and RC timing and build a simple blinking circuit

What's inside your Electronics course

A sample path Learnr builds for Electronics. Your real course adapts to your goal and level.

1. Voltage, current, resistance and electrical safety
2. Series and parallel circuits
3. Capacitors, inductors and RC timing
4. Diodes, LEDs and power supplies
5. Transistors and operational amplifiers
6. Digital logic and microcontrollers

How long does it take to learn Electronics?

Basic circuit theory and simple breadboard projects take about 1 to 2 months at 3 to 5 hours a week with a hands-on kit. Comfort with transistor and op-amp design takes 6 months or more, and how often you actually build circuits matters more than reading time.

What you need before you start

Basic algebra for Ohm's law and simple calculations. An inexpensive starter kit, a breadboard and a multimeter are strongly recommended, since electronics is learned by building.

Common mistakes to avoid

Connecting an LED without a current-limiting resistor, which can burn it out instantly. Calculate the resistor before you power anything.
Measuring current with the meter placed across a power source. That creates a short circuit; current is measured in series with the load.
Experimenting with mains wall power as a beginner. Stick to batteries and low-voltage supplies until you have proper training, because mains voltage can kill.

How Learnr builds your course

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Electronics questions, answered

Is electronics safe to learn at home?

Yes, if you stay with batteries and low-voltage supplies, use a soldering iron carefully in a ventilated area, and never work on mains-powered circuits or open devices that plug into the wall.

Do I need a lot of math for electronics?

Algebra is enough for beginner circuits using Ohm's law and the power formula. Analog design, filters and signal processing use more math, including some calculus and complex numbers.

What is the difference between electronics and electrical engineering?

Electronics usually means low-power circuits built from components like transistors and chips. Electrical engineering is a broader profession that also covers power systems, motors and grid-scale electricity.