There are lots of online videos and websites to help you review and learn basic electronics but not many to help you *learn how electric circuits and electronics really work*. And you could waste a lot of time trying to find help.

So, how can you learn about circuits and electronics and not waste time? |
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Use 17Calculus Electric Circuits and Electronics |

Electric Circuits or Electronics |
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There are many different explanations for the difference between the terms 'electronics' and 'electric circuits'. We cover both and do not attempt to separate the two on this site but use the term that seems to fit at the time. |

We have sorted through the videos and websites for you and organized everything you need. We build discussion around the best videos and provide lots of practice problems, ALL with worked out solutions, *not just answers but complete, worked out in detail and explained solutions*.

So who is this site for? We built this site for the serious student in electrical engineering and electronics at the college level. You need math, including college calculus (a first course in differential equations will help but is not required), and some basic chemistry and we explain the topics in lots of detail. You will also find this site helpful if you are refreshing your knowledge in circuits or electronics or if you want to understand things in more depth.

So how much will this cost you? Nothing! All the material is free. |
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To get started, select a topic from the menu. |

Electric Circuits and Electronics Book Recommendations

Here are a few books that we recommend from which to learn about circuits and electronics. For a complete list of books and to read about how to get the most out of your textbooks and supplementary books, go to our college books page.

Learn how electronics really work.

The Unit Circle

The Unit Circle [wikipedia]

Basic Trig Identities

Set 1 - basic identities | |||
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\(\displaystyle{ \tan(t) = \frac{\sin(t)}{\cos(t)} }\) |
\(\displaystyle{ \cot(t) = \frac{\cos(t)}{\sin(t)} }\) |
\(\displaystyle{ \sec(t) = \frac{1}{\cos(t)} }\) |
\(\displaystyle{ \csc(t) = \frac{1}{\sin(t)} }\) |

Set 2 - squared identities | ||
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\( \sin^2t + \cos^2t = 1\) |
\( 1 + \tan^2t = \sec^2t\) |
\( 1 + \cot^2t = \csc^2t\) |

Set 3 - double-angle formulas | |
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\( \sin(2t) = 2\sin(t)\cos(t)\) |
\(\displaystyle{ \cos(2t) = \cos^2(t) - \sin^2(t) }\) |

Set 4 - half-angle formulas | |
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\(\displaystyle{ \sin^2(t) = \frac{1-\cos(2t)}{2} }\) |
\(\displaystyle{ \cos^2(t) = \frac{1+\cos(2t)}{2} }\) |

Trig Derivatives

\(\displaystyle{ \frac{d[\sin(t)]}{dt} = \cos(t) }\) |
\(\displaystyle{ \frac{d[\cos(t)]}{dt} = -\sin(t) }\) | |

\(\displaystyle{ \frac{d[\tan(t)]}{dt} = \sec^2(t) }\) |
\(\displaystyle{ \frac{d[\cot(t)]}{dt} = -\csc^2(t) }\) | |

\(\displaystyle{ \frac{d[\sec(t)]}{dt} = \sec(t)\tan(t) }\) |
\(\displaystyle{ \frac{d[\csc(t)]}{dt} = -\csc(t)\cot(t) }\) |

Inverse Trig Derivatives

\(\displaystyle{ \frac{d[\arcsin(t)]}{dt} = \frac{1}{\sqrt{1-t^2}} }\) |
\(\displaystyle{ \frac{d[\arccos(t)]}{dt} = -\frac{1}{\sqrt{1-t^2}} }\) | |

\(\displaystyle{ \frac{d[\arctan(t)]}{dt} = \frac{1}{1+t^2} }\) |
\(\displaystyle{ \frac{d[\arccot(t)]}{dt} = -\frac{1}{1+t^2} }\) | |

\(\displaystyle{ \frac{d[\arcsec(t)]}{dt} = \frac{1}{\abs{t}\sqrt{t^2 -1}} }\) |
\(\displaystyle{ \frac{d[\arccsc(t)]}{dt} = -\frac{1}{\abs{t}\sqrt{t^2 -1}} }\) |

Trig Integrals

\(\int{\sin(x)~dx} = -\cos(x)+C\) |
\(\int{\cos(x)~dx} = \sin(x)+C\) | |

\(\int{\tan(x)~dx} = -\ln\abs{\cos(x)}+C\) |
\(\int{\cot(x)~dx} = \ln\abs{\sin(x)}+C\) | |

\(\int{\sec(x)~dx} = \) \( \ln\abs{\sec(x)+\tan(x)}+C\) |
\(\int{\csc(x)~dx} = \) \( -\ln\abs{\csc(x)+\cot(x)}+C\) |

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