Welcome to Spinning Numbers! Learn about electricity and electrical engineering, explained at the level of an undergraduate EE student.
Become familiar with the most important electrical quantities: charge, current, and voltage.
Circuits are made of resistors, capacitors, inductors, and power sources.
Resistors in series and parallel, the voltage divider, delta-wye resistor networks.
Kirchhoff’s Laws, node voltage method, mesh and loop current methods.
Linearity and superposition. Source transformation. Thévenin and Norton equivalents.
Natural response is what a circuit does with its own internal stored energy.
If we limit signals to only sine waves, we get AC analysis based on complex exponentials.
The operational amplifier is the building block of analog electronics.
Using a diode in a circuit.
Here’s a list of everything on Spinning Numbers. Topic areas, articles, videos, images, etc.
Where does the name Spinning Numbers come from?
These videos and articles began as my contribution to Khan Academy where I was the Electrical Engineering Content Fellow in 2016. In the past year all the articles you find here have been significantly improved. I hope you enjoy them.
- Willy McAllister