[awhitby]

Also "high tension power lines," which being heavy catenaries presumably are in high mechanical tension, but must surely have gotten that name from the voltage = tension thing.

German has this too: voltage = Spannung = tension.

This must go right back to the earliest writings on voltage as a concept.

[natmaka]

French also has "tension" in this very sense.

https://fr.wikipedia.org/wiki/Tension_%C3%A9lectrique