A project you can do to help slow the pandemic. Instructable or Project Guide
FearOfPhysics.com: A free online electronics course

Want to learn about electronics?

Welcome to our FREE video-based electronics class! Want to build your own electronics projects? Heard of the Arduino? Resistors? and Transistors? We'll explain all of these things to you!

These videos (each less than 10 minutes long) are meant to be watched while you actually build and do the electronics experiments described. So to get started, purchase these items, which are a list of all parts used in this video sequence.

Then, simply watch each video, one by one. Have fun!

The Electronics Lessons

Lesson 1: Introduction to the "voltmeter" (watch it)
Lesson 2: How to decode the color bands on a resistor (watch it)
Lesson 3: Tour of the electrical components used in this video series (watch it)
Lesson 4: Measuring the voltage of various batteries. (watch it)
Lesson 5: Why are there two leads on a voltmeter? (watch it)
Lesson 6: Doing some basic resistance measurements (watch it)
Lesson 7: Resistance of opened and closed switches. (watch it)
Lesson 8: Resistance of a relay. (watch it)
Lesson 9: Measuring the resistance of distilled water tap water and dirt (yes dirt). (watch it)
Lesson 10: Introduction to the electrical breadboard. (watch it)
Lesson 11: Investigating a breadboard by "ohming out" the various hole patterns. (watch it)
Lesson 12: The analogy between voltage current and resistance with a water pump water and pipes (watch it)
Lesson 13: The difference between voltage vs. current measurements with a water pump analogy (watch it)
Lesson 14: The difference between voltage and current measurements emphasized with electrical schematics. (watch it)
Lesson 15: Battery resistor and LED circuit with a switch (watch it)
Lesson 16: CdS photoresistors and the potentiometer in LED circuits. (watch it)
Lesson 17: Basic electronic schematics (watch it)
Lesson 18: Current measurements with 3 different resistors and an LED. (watch it)
Lesson 19: Doing some measurements with Ohm's Law in mind. (watch it)
Lesson 20: Considering Ohm's Law where the voltage changes (watch it)
Lesson 21: Considering Ohm's Law with a photocell (photoresistor) and thermistor (watch it)
Lesson 22: Considering Ohm's law with a flashing LED. (watch it)
Lesson 23: Measuring voltages across an LEDs (watch it)
Lesson 24: Using a reed relay as a magnetically controlled switch (watch it)
Lesson 25: Voltage drop across a diode and different colored LEDs. (watch it)
Lesson 26: A mini-lecture on the voltage divider. (watch it)
Lesson 27: Examining current flow in a voltage divider (watch it)
Lesson 28: Current flow into and out of a lightbulb (watch it)
Lesson 29: How voltage dividers work: looking at the current flow. (watch it)
Lesson 30: Building a voltage divider with two resistors then a resistor and a photocell (watch it)

Lesson 31: Using a thermistor and potentiometer in a voltage divider. (watch it)
Lesson 32: Introduction to the Arduino and its ability to read voltages. (watch it)
Lesson 33: Using a photocell in a voltage divider and measuring it with an Arduino. (watch it)
Lesson 34: Using the Arduino as a voltmeter and analog to digital conversion (watch it)
Lesson 35: Arduino software to read a voltage (have the Arduino act like a voltmeter). (watch it)
Lesson 36: Proposal to use an Arduino to measure the earth's gravity (watch it)
Lesson 37: The Arduino-based pendulum to measure the earth's gravity. (watch it)
Lesson 38: Analyzing the Arduino pendulum data to measure the earth's gravity (watch it)
Lesson 39: Software for an Arduino that allows for the determination of the earth's gravity using a potentiometer-based pendulum. (watch it)
Lesson 40: Flashing an LED with an Arduino (watch it)
Lesson 41: Build an Arduino-based heat or fire alarm (watch it)
Lesson 42: An introduction to the NPN transistor (watch it)
Lesson 43: Using the brightness of an LED as a current indicator (watch it)
Lesson 44: Build a simple NPN transistor circuit with LEDs as the visual elements (watch it)
Lesson 45: Using LEDs to show how a transistor amplifies current (watch it)
Lesson 46: Use an NPN transistor to turn on a lightbulb motor and buzzer (watch it)
Lesson 47: A transistor circuit that can turn on a buzzer light bulb or motor in response to changing light conditions. (watch it)
Lesson 48: Why one might use a transistor with an Arduino (watch it)
Lesson 49: Turning on a transistor with an Arduino digital output line (watch it)
Lesson 50: Building an automatic night light with an Arduino and transistor (watch it)
Lesson 51: The use of base and collector resistors with an NPN transistor (watch it)
Lesson 52: Mini-lecture on an introduction to capacitors (watch it)
Lesson 53: Demonstrating how capacitors store electric charge or electric energy (watch it)
Lesson 54: Demonstrating how a resistor and capacitor (RC) circuit gives timing in electronics (watch it)
Lesson 55: The speed at which a voltage appears on a voltage divider vs. resistor/capacitor (RC) circuit (watch it)
Lesson 56: Watching voltage fall in a resistor/capacitor (RC) circuit (watch it)
Lesson 57: The charge equation for a capacitor Q=CV and using this with a resistor/capacitor (RC) circuit (watch it)
Lesson 58: Using resistor/capacitor (RC) circuits and a transistor to turn on an LED (watch it)
Lesson 59: The "hello world" of electronics: flashing an LED (watch it)
Lesson 60: Introduction to a relay as the core element in building an LED flasher (watch it)
Lesson 61: Proposing how we'll build a relay that can automatically discharge a capacitor (watch it)
Lesson 62: How to build the relay that turns on and off automatically (watch it)
Lesson 63: Putting the LED into the relay clicker circuit (watch it)