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How does a fluorescent starter work?
A fluorescent light does not have the usual glowing filament of an incandescent bulb, bulb, but instead con a mercury vapor that gives off ultraviolet light when ionized. The ultraviolet light makes particles tha coat the inside of the tube, and these particles glow or fluoresce (see How Fluorescent Lamps Work details). Fluorescent starters are used in several types of fluorescent lights. The starter is there to help the l light. When voltage is applied to the fluorescent lamp, here's what happens: 1. The starter (which is simply a timed switch) allows current to flow through the filaments filam ents at the ends of the tube. 2. The current causes the starter's contacts to heat up and open, thus interrupting the flow of current. The tube lights. 3. Since the lighted fluorescent tube has a low resistance, the ballast now serves as a current limiter. When you turn on a fluorescent tube, the starter is a closed switch. The filaments at the ends of the are heated by electricity, and they create a cloud of electrons inside the tube. The fluorescent starter time-delay switch that opens after a second or two. When it opens, the voltage across the tube allow stream of electrons to flow across the tube and ionize the mercury vapor.
Without the starter, a steady stream of electrons is never created between the two filaments, and the lamp flickers. Without the ballast, the arc is a short circuit between the filaments, and this short circu contains a lot of current. The current either vaporizes the filaments or causes the bulb to explode. According to Sam's F-Lamp FAQ: FAQ:
Master your semester with Scribd The most common fluorescent starter is called a "glow tube starter" (or just starter) and contains a Read Free For 30 Days Sign up to vote on this title small gas (neon, etc.) filled tube and an optional radio frequency interference (RFI) suppression capacitor in aTimes cylindrical aluminum can with a 2 pin base. While all starters areuseful physically & The New York Useful Not Cancel anytime. interchangeable, the wattage rating of the starter should be matched to the wattage rating of the Special offer for students: Only $4.99/month. fluorescent tubes for reliable operation and long life.
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What is the difference between a fluorescent light an a neon light? You're Reading a Preview Unlock full access with a free trial.
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Many offices are lit with fluorescent lamps. Master Ayour semester with Scribd neon light is the sort of light you see used in advertising signs. These are made Read Free Foron 30this Days Sign up tosigns vote title of long, narr spel glass tubes, and these tubes are often bent into all sorts of shapes. The tube of a neon light can & The New York Times Useful Not useful a word, for example. These tubes emit light in different colors. Cancel anytime.
Special offer for students: Only $4.99/month. A fluorescent light, on the other hand, is most often a long, straight tube that produces white light. Yo
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accept energy in one form (for example, energy from a high-speed electron as in a TV tube -- see Television Works) and emit the energy in the form of visible light. In a fluorescent lamp, the phospho accepts the energy of ultraviolet photons and emits visible photons. The light we see from a fluorescent tube is the light given off by the phosphor that coats the inside of tube (the phosphor fluoresces when energized, hence the name). The light of a neon tube is the col light that the neon atoms give off directly.
How Fluorescent Lamps Work
The central element in a fluorescent lamp is a sealed glass tube. The tube contains a small bit of mercury and an inert gas, typically argon, kept under very low pressure. The tube also contains a phosphor powder , coated along the inside of the glass. The tube has two electrodes, one at each which are wired to an electrical circuit. The electrical circuit, which we'll examine later, is hooked up t alternating current (AC) supply
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When you turn the lamp on, the current flows through the electrical circuit to the electrodes. There is Unlock full access with a free trial. considerable voltage across the electrodes, so electrons will migrate through the gas from one end o tube to the other. This energy changes some of the mercury in the tube from a liquid to a gas. As Download With Free electrons and charged atoms move through the tube, some of Trial them will collide with the gaseous me atoms. These collisions excite the atoms, bumping electrons up to higher energy levels. When the electrons return to their original energy level, they release light photons.
As we saw in the last section, the wavelength of a photon is determined by the particular electron arrangement in the atom. The electrons in mercury atoms are arranged in such a way that they most Read Free For 30 Days Sign up to vote on this title release light photons in the ultraviolet wavelength range. Our eyes don't register ultraviolet photons Useful Not useful this sort of light needs to be converted into visible light to illuminate the lamp.
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Special offer for students: Only $4.99/month. This is where the tube's phosphor powder coating comes in. Phosphors are substances that give of
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Conventional incandescent light bulbs also emit a good bit of ultraviolet light, but they do not convert Unlock full access with a free trial. of it to visible light. Consequently, a lot of the energy used to power an incandescent lamp is wasted. fluorescent lamp puts this invisible light to work, and so is more efficient. Incandescent lamps also l Download With lamps. Free Trial more energy through heat emission than do fluorescent Overall, a typical fluorescent lamp is to six times more efficient than an incandescent lamp. People generally use incandescent lights in th home, however, since they emit a "warmer" light -- a light with more red and less blue.
As we've seen, the entire fluorescent lamp system depends on an electrical current flo wing through t gas in the glass tube. In the next section, we'll see what a fluorescent lamp needs to do to establish t Read Free Foron 30this Days Sign up to vote title current.
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