Watch electricity hit a fork in the road at half a billion frames per second

In this video, I measure a wave of electricity traveling down a wire, and answer the question - how does electricity know where to go? How does "electricity" "decide" where electrons should be moving in wires, and how long does that process take? Spoiler alert - very fast!

I've been very excited about this project for a while - it was a lot of work to figure out a reliable way to make these measurements, but I've learned SO much by actually watching waves travel down wires, and I hope you do too!

There will be a Q&A about this video posted in a few weeks on the second channel, and if you head over there right now, you'll see two direct follow ups to this video with experimental details, and a section about "impedance matching" that was cut from this script.
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Media Credits:
Slomoguys clip used with permission. Thanks Gav!    • Elephant Rifle Annihilates Ballistic Gel a...  
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0:00 a hypothetical question
3:30 Measurement difficulties
7:44 Individual oscilloscope traces
10:23 Electricity moves through Y circuit
12:54 The single wire experiment – how electrons move
17:32 Electrons hitting a dead end
20:23 Revisiting the Y circuit
22:16 The water channel model