'transformer' originates from the Latin word 'transformare,' where 'trans-' meant 'across' and 'formare' meant 'to form.'

'transformare' transformed into the French word 'transformer,' and eventually became the modern English word 'transformer' through Middle English.

Initially, it meant 'to change in form or appearance,' but over time it evolved into its current meaning of 'a device that transfers electrical energy.'