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Here I turn a lamp on through the longest loop at the speed of light!!! 

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Reference videos on this subject:
Veritasium’s 1st Video: https://youtu.be/bHIhgxav9LY
My 1st Analysis Video: https://youtu.be/iph500cPK28
Veritasium’s 2nd Video: https://youtu.be/oI_X2cMHNe0
My 2nd Analysis Video: https://youtu.be/O-WCZ8PkrK0

By: Mehdi Sadaghdar

0:00 Intro to the Test
2:31 The Theory Behind the Wire
3:12 Turning an LED on Through a Long Loop
10:22 The TEST, See the Electric Wave Reflections

Here you will see how a transmission line actually works, the electric fields that travel at the speed of light through the loop, reflections of waves from the ends of the line and how impedance matching, or not matching, changes the reflection of the waves