Dynamo

Definition: (from dictionary.com)
-noun
1. an electric generator, especially for direct current
2. an energetic, hardworking, forceful person

Examples:
"He was a dynamo in the kitchen - no food left unless it was cooked to perfection."
"Three hours of practice each day makes her the only dynamo in underwater basket weaving in the world."

Origin: (from etymonline.com)
"1882, short for dynamo-machine, from German dynamoelektrischemaschine 'dynamo-electric machine,' coined 1867 by its inventor, German electrical engineer Werner Siemans (1816-1892), from Greek dynamis 'power.'"

Awkwardness rating: 4

Gordon Ramsay is the ultimate dynamo in the kitchen. (caffevita.com)