What is the origin of the idiom "bright spark" and when to use it?

The idiom "bright spark" is believed to have originated in British English. The phrase likely emerged from the imagery of a spark representing intelligence or brilliance, combined with the adjective "bright" to emphasize the person's intellectual abilities. It is a metaphorical expression that conveys the idea of someone shining intellectually or having a quick, sharp mind. Over time, the phrase has become a commonly used idiom to commend or recognize someone's intelligence or cleverness.