An electrical generator that converts mechanical energy into direct current electricity using electromagnetic induction.
From Greek dynamis meaning 'power' or 'force.' Coined in the 1860s by physicist Michael Faraday to describe his electromagnetic generator invention.
The dynamo was crucial to the second industrial revolution, making possible everything from electric lighting to trolley cars, and its principle still powers bicycle lights today.
Originally neutral engineering term; became gendered when applied as slang praising energetic people—applied more frequently to men as praise, to women as exception/surprise ("she's a dynamo for a woman").
Use descriptively without gender qualifier; avoid "for a woman/man" framing.
["energetic","driven","high-performing"]
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