<commit_before>--- 
layout: page
title:  Spinning Numbers 
author: <NAME>
comments: true
---

Welcome to Spinning Numbers! Learn about electricity and electrical engineering.  

### [Circuit sandbox simulator]({{ site.baseurl }}{% link _articles/circuit-sandbox.md %}) [![circuit sandbox]({{ site.baseurl }}{% link i/circuit_sandbox.png %}){: height="80px" :}]({{ site.baseurl }}{% link _articles/circuit-sandbox.md %})

* [Circuit sandbox](https://spinningnumbers.org/circuit-sandbox/index.html) in English
* [Circuit sandbox](https://spinningnumbers.org/circuit-sandbox/index-es.html) en español
* [电路沙箱](https://spinningnumbers.org/circuit-sandbox/index-zh.html) 或简体中文 (simplified Chinese)
* [回路サンドボックス](https://spinningnumbers.org/circuit-sandbox/index-ja.html) 日本語で (Japanese)  
<small>Want to help translate Circuit Sandbox into other languages? [It's easy!](a/circuit-sandbox.html#translation)</small>

### [Introduction]({{ site.baseurl }}{% link _topics/topic-introduction.md %})
Become familiar with the most important electrical quantities: charge, current, and voltage.

### [Circuit elements]({{ site.baseurl }}{% link _topics/topic-circuit-elements.md %})
Circuits are made of resistors, capacitors, inductors, and power sources.

### [Resistor circuits]({{ site.baseurl }}{% link _topics/topic-resistor-circuits.md %})
Resistors in series and parallel, the voltage divider, delta-wye resistor networks.

### [DC circuit analysis]({{ site.baseurl }}{% link _topics/topic-dc-analysis.md %})
Kirchhoff's Laws, node voltage method, mesh and loop current methods. 

### [Special topics in DC analysis]({{ site.baseurl }}{% link _topics/topic-dc-analysis-special.md %})
Linearity and superposition. Source transformation. Thévenin and Norton equivalents.

### [Natural and forced response]({{ site.baseurl }}{% link _topics/topic-natural-and-forced-response.md %})
Natural response is what a circuit does with its own internal stored energy.  

### [AC circuit analysis]({{ site.baseurl }}{% link _topics/topic-ac-analysis.md %})
If we limit signals to only sine waves, we get AC analysis based on complex exponentials. 

### [Special topics in AC analysis]({{ site.baseurl }}{% link _topics/topic-ac-special.md %})

Decibels and RMS.

### [Amplifiers]({{ site.baseurl }}{% link _topics/topic-amplifiers.md %})
The operational amplifier is the building block of analog electronics.

### [Semiconductors]({{ site.baseurl }}{% link _topics/topic-semiconductors.md %}) 
Using a diode in a circuit.

### [Electrostatics]({{ site.baseurl }}{% link _topics/topic-electrostatics.md %})  
Electric force is described by Coulomb's Law. Electric field. Formal definition of voltage.

### [The name <img class="sn-logo" src="/i/sn_logo2.svg">]({{ site.baseurl }}{% link _articles/whats-with-the-name.md %})     
Where does the name [Spinning Numbers]({{ site.baseurl }}{% link _articles/whats-with-the-name.md %}) come from?

#### [Printing]({{ site.baseurl }}{% link printing.md %})  
Tips on the best way to [print]({{ site.baseurl }}{% link printing.md %}) articles from Spinning Numbers.

#### [Everything]({{ site.baseurl }}{% link _topics/everything.md %})
List of [everything]({{ site.baseurl }}{% link _topics/everything.md %}) on Spinning Numbers. Topics, articles, videos, images, and on and on.

----

These videos and articles began at Khan Academy where I had the honor of being the Electrical Engineering Content Fellow in 2016. The concepts are explained at the level of an undergraduate EE student. Motivated middle school and high school students can get a lot from the course. 

I set up this Spinning Numbers web site after completing my KA fellowship. I've reviewed and significantly improved all the articles, and added several new articles. A nice new feature is the Circuit Sandbox simulator. You will find simulation models included in most articles, to let you try your hand and bring the concepts to life. 

Good luck as you learn about electronics and electrical engineering. Please leave a comment if you enjoy your visit, and ask questions. I'm here to help.

   \- <NAME>
<commit_msg>Create external resource section, start with a glossary.<commit_after>--- 
layout: page
title:  Spinning Numbers 
author: <NAME>
comments: true
---

Welcome to Spinning Numbers! Learn about electricity and electrical engineering.  

### [Circuit sandbox simulator]({{ site.baseurl }}{% link _articles/circuit-sandbox.md %}) [![circuit sandbox]({{ site.baseurl }}{% link i/circuit_sandbox.png %}){: height="80px" :}]({{ site.baseurl }}{% link _articles/circuit-sandbox.md %})

* [Circuit sandbox](https://spinningnumbers.org/circuit-sandbox/index.html) in English
* [Circuit sandbox](https://spinningnumbers.org/circuit-sandbox/index-es.html) en español
* [电路沙箱](https://spinningnumbers.org/circuit-sandbox/index-zh.html) 或简体中文 (simplified Chinese)
* [回路サンドボックス](https://spinningnumbers.org/circuit-sandbox/index-ja.html) 日本語で (Japanese)  
<small>Want to help translate Circuit Sandbox into other languages? [It's easy!](a/circuit-sandbox.html#translation)</small>

### [Introduction]({{ site.baseurl }}{% link _topics/topic-introduction.md %})
Become familiar with the most important electrical quantities: charge, current, and voltage.

### [Circuit elements]({{ site.baseurl }}{% link _topics/topic-circuit-elements.md %})
Circuits are made of resistors, capacitors, inductors, and power sources.

### [Resistor circuits]({{ site.baseurl }}{% link _topics/topic-resistor-circuits.md %})
Resistors in series and parallel, the voltage divider, delta-wye resistor networks.

### [DC circuit analysis]({{ site.baseurl }}{% link _topics/topic-dc-analysis.md %})
Kirchhoff's Laws, node voltage method, mesh and loop current methods. 

### [Special topics in DC analysis]({{ site.baseurl }}{% link _topics/topic-dc-analysis-special.md %})
Linearity and superposition. Source transformation. Thévenin and Norton equivalents.

### [Natural and forced response]({{ site.baseurl }}{% link _topics/topic-natural-and-forced-response.md %})
Natural response is what a circuit does with its own internal stored energy.  

### [AC circuit analysis]({{ site.baseurl }}{% link _topics/topic-ac-analysis.md %})
If we limit signals to only sine waves, we get AC analysis based on complex exponentials. 

### [Special topics in AC analysis]({{ site.baseurl }}{% link _topics/topic-ac-special.md %})

Decibels and RMS.

### [Amplifiers]({{ site.baseurl }}{% link _topics/topic-amplifiers.md %})
The operational amplifier is the building block of analog electronics.

### [Semiconductors]({{ site.baseurl }}{% link _topics/topic-semiconductors.md %}) 
Using a diode in a circuit.

### [Electrostatics]({{ site.baseurl }}{% link _topics/topic-electrostatics.md %})  
Electric force is described by Coulomb's Law. Electric field. Formal definition of voltage.

### [The name <img class="sn-logo" src="/i/sn_logo2.svg">]({{ site.baseurl }}{% link _articles/whats-with-the-name.md %})     
Where does the name [Spinning Numbers]({{ site.baseurl }}{% link _articles/whats-with-the-name.md %}) come from?

#### [Printing]({{ site.baseurl }}{% link printing.md %})  
Tips on the best way to [print]({{ site.baseurl }}{% link printing.md %}) articles from Spinning Numbers.

#### [Everything]({{ site.baseurl }}{% link _topics/everything.md %})
List of [everything]({{ site.baseurl }}{% link _topics/everything.md %}) on Spinning Numbers. Topics, articles, videos, images, and on and on.

----
#### External resources

[Glossary of electrical terms](https://electricalschool.org/)

----

These videos and articles began at Khan Academy where I had the honor of being the Electrical Engineering Content Fellow in 2016. The concepts are explained at the level of an undergraduate EE student. Motivated middle school and high school students can get a lot from the course. 

I set up this Spinning Numbers web site after completing my KA fellowship. I've reviewed and significantly improved all the articles, and added several new articles. A nice new feature is the Circuit Sandbox simulator. You will find simulation models included in most articles, to let you try your hand and bring the concepts to life. 

Good luck as you learn about electronics and electrical engineering. Please leave a comment if you enjoy your visit, and ask questions. I'm here to help.

   \- <NAME>

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