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Is the black wire on a lamp connection plus or minus?
The color of the wire does not indicate its polarity. In electrical systems, the polarity is typically designated as positive (+) and negative (-) rather than plus or minus. To determine which wire is positive or negative on a lamp connection, you would need to consult the manufacturer's instructions or use a multimeter to check the voltage.
You are wiring a LED lamp through a transformer you have a polarized plug and you know positive and negative The transformer is marked live and neutral Does live correspond with positive or negative?
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.
What to use to measure height of a lamp?
probably to measure a lamp depending on if its a desk lamp or a stand up lamp, if you use a stand up lamp, i would suggest using either feet or inches
Would you measure a lamp in grams or kilograms?
Kilograms. A lamp would typically weigh at around 10 kg
How is a shadow formed on a paper?
Well here are the steps: 1.get a paper,and a lamp 2.put the paper down. 3.Then put the lamp facing the paper. 4.Then put your hand under the lamp's light. DONE!!
What is the nature of the slope of the voltage-resistance characteristics for the carbon lamp?
for Tungsten lamp the slope of the curve is positive where for carbon it is negative
What material is used for fillament in tungsten lamp?
tungsten
Which material is used for for filament in tungsten lamp?
i believe it is cadnium.
Why is iodine sometimes introduced into a tungsten lamp?
Iodine is introduced into a tungsten lamp to combine with the tungsten vaporized from the filament and create a tungsten iodide compound. This compound prevents the tungsten from depositing back onto the filament, thus extending the lifespan of the lamp. It also helps to maintain a stable color temperature of the light emitted by the lamp.
What is the purpose of halogen gas in a tungsten-halogen lamp?
The purpose of halogen gas in a tungsten-halogen lamp is to increase the lifespan and efficiency of the lamp. The halogen gas helps to recycle evaporated tungsten back onto the filament, preventing blackening of the glass and extending the life of the lamp.
Why are V-i characterstics different for tungsten and carbon lamp?
The V-I characteristics are different for tungsten and carbon lamps because of their different electrical resistances and thermal properties. Tungsten lamps have a higher resistance and operate at higher temperatures, resulting in a steeper voltage-current relationship. Carbon lamps have lower resistance and operate at lower temperatures, leading to a shallower V-I curve.
What is lamp types?
There are two types of lamps the tungsten halogen lamps and incandescent lamps. Tungsten Halogen Lamps are similar to incandescent lamps and produce light in the same manner from a tungsten filament; however the bulb contains a halogen gas (bromine or iodine) which is active in controlling tungsten evaporation, whereas the incandescent lamp suppresses tungsten evaporation.
Why the lamp lights up?
Incandescence of a finely coiled tungsten wire.
Why the slope of voltage-resistance characteristic increases in the case of tungsten lamp and decresing in case of carbon lamp?
If the filament really was made from a material that has a negative temperature coefficient (as temperature increases, resistance decreases) then the decreasing resistance would cause more and more current to be taken as the lamp heated up and the temperature would get higher and higher in a runaway manner until either the power supply's breaker would trip or (more likely) the light bulb's filament would simply burn open. In fact the filament has to be made from a material that has a positive temperature coefficient. (As temperature increases, resistance increases.) Then, as the bulb's temperature rises, its filament's increasing resistance causes less current to be taken than when it was cold. Quite quickly a stable "steady-state" temperature and "running" resistance is reached so that the bulb simply continues to give out a steady amount of light according to the current it is taking from the electricity supply.
Difference between tungsten lamps and carbon lamps?
Tungsten lamps use a filament made of tungsten, while carbon lamps use a filament made of carbon. Tungsten lamps have a longer lifespan and higher efficiency compared to carbon lamps. Additionally, tungsten lamps produce a whiter and brighter light compared to the yellowish light produced by carbon lamps.
What light source does Spectrophotometry utilizes?
Spectrophotometry utilizes a light source such as a tungsten lamp, deuterium lamp, or xenon lamp to produce light at specific wavelengths. The light is then passed through a sample to determine its absorbance or transmittance at different wavelengths.
What are you hearing when you shake a light bulb?
The piece of coiled wire made of Tungsten (Wolfram) that heats up and glows in the lamp.
