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  • Author Author: tariq.ahmad
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How Do Transformers Work? -- The Learning Circuit 97

 

 

In this video, Karen talks about how transformers work. When current passes through a wire, an electromagnetic field is formed. As that field changes, forming or collapsing, it creates electromotive force which can cause electrons in nearby conductors to move. This is how induction works. Transformers work through mutual induction, where current passes through a primary coil and INDUCES current in a secondary coil. In this way, power can be transferred and transformed without needing a physical, electrical connection. Check out the video as Karen dives deeper into the science of why and how this works as well as the uses for transformers.

  • Nice intro to transformers.

     

    When Tesla began defining power transmission, he created most of the patents that led to the electrification of the world.

    He was the person who came up with the idea of the three phased power system, as he found that each phase helped to support the mutual inductance down the power lines which helped reduce the loses during power transmission.

     

    DAB

  • Enjoyed the learning. Where were you forty years ago when I was sitting in the basement of a college listen to some old fart drone on about emf?

  • Hi Karen, thank you for this very interesting video.

     

    I have a little but very interesting problem for you. It took me a lot of time to find out but it's worth it.

     

    Think about the small phone charger you use every day. These chargers are now very common and I use them to power digital chips that require 5 volts. These small devices are plugged directly to the main power line. These lines are (in France) protected with a 16A fuse. That means that  these lines can deliver 15A at 230V or 15x230=3450 watts ! But these devices sometimes only deliver 0.75A at 5V or less then 5 watts.

     

    The question is therefore, how do they cut all that power ?