Where does “vaihtosähkövastus” come from?

vaihtosähkövastus (Finnish) comes from Finnish vastus, from Finnish vasta-, from Finnish vasta, from Swedish kvast, from Old Swedish quaster, from Old Norse kvǫstr, from Proto-Germanic kwastuz, from Proto-Indo-European gʷes- — twig; leafwork.

Ancestry of “vaihtosähkövastus”, step by step

vaihtosähkövastus traces back through two separate lines of ancestry.

via Finnish vastus

StepLanguageWordMeaning
1Finnishvastusresistor; resistance; drag
2Finnishvasta-Expressing opposition or contrast: counter-,...
3FinnishvastaExpressing delay or that something takes place...
4Swedishkvastbroom; tassel; cyme
5Old Swedishquaster
6Old Norsekvǫstr
7Proto-Germanickwastuztuft; tassel
8Proto-Indo-Europeangʷes-twig; leafwork

via Finnish vaihtosähkö

StepLanguageWordMeaning
1Finnishvaihtosähköalternating current
2Finnishvaihtoexchange; swap; shift key
3Finnishvaihtaato change, replace; to exchange, switch; to swap
4Proto-Finnicvaihtadakto change
5Proto-Finnic-tadakForms verbs from both nominal and verbal stems
6Proto-Uralic-ta-Forms verbs from nouns; Forms causative verbs...
Every word from Proto-Indo-European gʷes-Every word from Finnish vasta-Every word from Proto-Germanic kwastuz