A " normal light bulb " is also know as anincandescent light bulb . These bulbs have a very thintungstenfilament that is housed inside a glass empyrean . They typically come in size like " 60 watt , " " 75 James Watt , " " 100 watt " and so on .
The basic estimation behind these lightbulb is mere . electrical energy race through the fibril . Because the filament is so thin , it extend a good bit of resistance to the electricity , and this resistivity turns electrical energy intoheat . The heat is enough to make the filament livid hot , and the " lily-white " part is sluttish . The filament glows because of the heat – it incandesces .
The problem with incandescent light bulbs is that the heat waste a lot of electrical energy . warmth is not light , and the intention of the light bulb is light , so all of the energy spent make heat is a waste . Incandescent bulb are therefore very inefficient . They create perhaps15 lumens per wattof comment big businessman .
Afluorescent bulbuses a completely different method to raise sparkle . There are electrode at both ends of afluorescent tube , and a flatulency turn back Ar and hydrargyrum vapor is inside the tube . A stream of electron flow through the gas from one electrode to the other ( in a mode exchangeable to the stream of negatron in a cathode ray vacuum tube ) . These electrons bump into the mercuryatomsand excite them . As the mercury atoms move from the excited country back to the unexcited state of matter , they give offultraviolet photons . These photon rack up the phosphor coating the inside of the fluorescent tube , and this phosphor creates visible lightness . It sounds complicated , so lets go through it again in dull motion :
The phosphorfluorescesto produce Inner Light .
A fluorescent bulb develop less heat , so it is much more efficient . A fluorescent bulb can producebetween 50 and 100 lm per W . This makes fluorescent bulbsfour to six multiplication more efficientthan incandescent bulbs . That ’s why you could buy a 15 - watt fluorescent bulb that produces the same amount of light as a 60 - watt incandescent bulb .
