olemus
elektriahelaid induktiivselt sidestav staatline seade,
võimaldab muuta vahelduvpinget, muutmata sagedust

Wiktionary:
2. (electrical engineering) a static device that transfers electric energy from one circuit to another by magnetic coupling
Their main use is to transfer energy between different voltage levels, which allows choosing most appropriate voltage for power generation, transmission and distribution separately.

näiteid
https://duckduckgo.com/?q=transformer+in+electronics&t=h_&iar=images&iax=images&ia=images
https://duckduckgo.com/?q=electric+transformer&t=h_&iar=images&iax=images&ia=images
https://1.bp.blogspot.com/-oxsaT66NpIk/VjOYVHbVLvI/AAAAAAAADfs/Vp_CoUCeCAY/s1600/build.jpg
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTrGCTQZy-BNQm9vu0YQ49KLkoVpCjYofAmEHCuHr3h_YTdN-vZ
https://circuitglobe.com/wp-content/uploads/2015/09/transformer-circuit.jpg

ülevaateid
https://en.wikipedia.org/wiki/Transformer
https://www.electronics-tutorials.ws/transformer/transformer-basics.html
https://en.wikipedia.org/wiki/Transformer_types
https://circuitdigest.com/tutorial/different-types-of-transformers-and-their-applications
https://circuitglobe.com/types-of-transformer.html
https://www.tomsonelectronics.com/blogs/news/types-of-transformers-used-in-electronics

vt ka
- pöördtrafo
- trafomälu
- transformeerima