GENERAL KNOWLEDGE

Detailed explanation-1: -However, Thomas Edison did not invent the light bulb. In 1840, British scientist Warren de la Rue developed an efficient light bulb using a coiled platinum filament but the high cost of platinum kept the bulb from becoming a commercial success.

Detailed explanation-2: -Long before Thomas Edison patented–first in 1879 and then a year later in 1880–and began commercializing his incandescent light bulb, British inventors were demonstrating that electric light was possible with the arc lamp.

Detailed explanation-3: -One day, Edison was sitting in his laboratory absent-mindedly rolling a piece of compressed carbon between his fingers. He began carbonizing materials to be used for the filament. He tested the carbonized filaments of every plant imaginable, including baywood, boxwood, hickory, cedar, flax, and bamboo.

Detailed explanation-4: -Accompanying him were two key associates, Charles Batchelor and John Kruesi. Batchelor, born in Manchester in 1845, was a master mechanic and draftsman who complemented Edison perfectly and served as his “ears” on such projects as the phonograph and telephone.