Kathy Joseph's Blog, page 8

History Of 3-Phase Electricity And It’s Distribution

Almost all of our electrical systems use 3 phase AC electricity, but how does it work, why was it invented, and who invented it? Ready for the surprising but complex and story as well as the answer to why some countries use 50 Hz and some use 60 Hz and one country uses both?

Table of ContentsIntroductionShort History of 2-phaseWestinghouse and ShallenbergerGalileo FerrarisNikola TeslaMichael Dolivo-DobrovolskiInitial interest in 3-phaseDevelopmen...

The Origin of The Polyphase Current

As I said in my video on the history of 3-phase electricity, both Nikola Tesla and Galileo Ferraris simultaneously discovered 2-phase electricity and the 2-phase motor that were, according to Tesla, “identical almost to the smallest detail.”[1] So, how did these two men come up with this amazing discovery? That is what this supplemental video is all about.

Table Of ContentsGalileo Ferraris: A Quick BiographyThe First Brushless Polyphase GeneratorTesla’s MotorArag...

James Joules: The Beer Brewer Who Changed The World

Most of us who know of James Joule know of him because we have heard of Joule’s law, his paddle experiment and/or we know that energy is measured in Joules in his honor. But who was Joule and how and why did he make his discoveries and what does it have to do with his friendship with a young scientist named William Thomson later knighted Lord Kelvin?

The Brewer Who Changed The WorldTable of ContentsWho is James Joule?Joule’s ChildhoodJoule and SturgeonJoule and C...

The Not So Honorable History of The Wheatstone Bridge

In my last video, on the history of Ohm’s law, I talked about part of how it was made famous was when a man named Charles Wheatstone attributed Ohm’s law to help him create what is now called the “Wheatstone Bridge” in 1843. However, I quickly learned that this “bridge” was actually created 10 years earlier than Wheatstone by a man named Samuel Christie, something that Wheatstone admitted in his paper. This caused my spidey sense to tingle: why did Christie make this bridge and why did it get na...