Asmall child watches you as you stir a spoonful of sugar into a glass of clear lemon-flavored drink. the child believes the sugar went away as it seemed to disappear. how would you explain to the child what happened to the sugar, and how could you show her how to get the sugar back.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.