In high school we were all taught that electricity only flows in a loop. But it seems that one can send a "pulse" down aan open conductor, this. This is used in a Time-domain reflectometer (https://en.wikipedia.org/wiki/Timetime-domain_reflectometerdomain reflectometer) how. How is this possible?
How can you send electricity down aan open conductor? what What didn't they explain in high school that allows this to be possible?