[afiori]

In my opinion the video made a couple of mistakes, which I think ElectroBoom's response* addresses nicely.

Also its proof using the pointing vector to show the flow of energy is misleading; In the video Derek shows that the energy flows toward the lamp when the circuit is already in a stable configuration, but the point of the video is to explore what happens before the circuit reaches that configuration.

This is relevant: assume that the right half of the cable is connected to the positive pole of the battery, in a stable configuration every point of the right half of the circuit has a positive charge (creating the poynting vector field as shown in the video) while 1/c seconds after the switch was closed the wire just to the right of the lightbulb will have a negative charge (the cable near it is positively charged from the battery and so the upper cable acts as a the negative half of a capacitor) which changes the direction of the poynting vector.

In the end it felt like it was telling you that its message was that energy travels via the fields but what it actually said what that switches cause electric interference.

*https://www.youtube.com/watch?v=iph500cPK28

[tigerlily]

I thought it was the Poynting vector? Easy to remember because it points in the direction of power flow :)

[wiml]

Yup, named after English physicist John H. Poynting (1852-1914).