Devices that change the voltage of electrical current, or fictional robots that can change shape from vehicles into fighting machines.
From Latin 'trans-' (across) and 'formare' (to shape). First used scientifically in the 1880s to describe electrical equipment, then popularized as a toy brand name in the 1980s.
The electrical transformer was invented right when electricity was becoming commonplace—without them, power couldn't travel long distances efficiently, so modern cities literally wouldn't exist.
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