Question

light bulbs vary significantly in their efficiency. which is the least efficient light bulb? incandescent light bulb fluorescent light bulb led light bulb

Explanation:

Incandescent light bulbs work by heating a filament until it glows, converting a large amount of electrical energy into heat rather than light. Fluorescent bulbs use gas and mercury vapor to produce ultraviolet light that is converted to visible light, which is more efficient than incandescent. LED bulbs use semiconductor materials to emit light directly, being the most energy - efficient among the three.

Answer:

Incandescent light bulb.