What is Lamp: Definition and 178 Discussions

A kerosene lamp (also known as a paraffin lamp in some countries) is a type of lighting device that uses kerosene as a fuel. Kerosene lamps have a wick or mantle as light source, protected by a glass chimney or globe; lamps may be used on a table, or hand-held lanterns may be used for portable lighting. Like oil lamps, they are useful for lighting without electricity, such as in regions without rural electrification, in electrified areas during power outages, at campsites, and on boats. There are three types of kerosene lamp: flat-wick, central-draught (tubular round wick), and mantle lamp. Kerosene lanterns meant for portable use have a flat wick and are made in dead-flame, hot-blast, and cold-blast variants.
Pressurized kerosene lamps use a gas mantle; these are known as Petromax, Tilley lamps, or Coleman lamps, among other manufacturers. They produce more light per unit of fuel than wick-type lamps, but are more complex and expensive in construction and more complex to operate. A hand-pump pressurizes air, which forces liquid fuel from a reservoir into a gas chamber. Vapor from the chamber burns, heating a mantle to incandescence and also providing heat.
Kerosene lamps are widely used for lighting in rural areas of Africa and Asia, where electricity is not distributed or is too costly. As of 2005, kerosene and other fuel-based illumination methods consume an estimated 77 billion litres of fuel per year, equivalent to 1.3 million barrels of oil per day. This is comparable to annual U.S. jet-fuel consumption of 76 billion litres per year.The World Health Organization considers kerosene to be a polluting fuel and recommends that “governments and practitioners immediately stop promoting its household use”. Kerosene smoke contains high levels of harmful particulate matter, and household use of kerosene is associated with higher risks of cancer, respiratory infections, asthma, tuberculosis, cataract, and adverse pregnancy outcomes.

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  1. A

    Why filament intensity profile of filament lamp deviates from blackboady curve?

    doing experiment today in which the intensity profile of a filament lamp (of surface temp around 2000K I think) is studied by passing it through a rotating grating apparatus and then reading the output from oscilloscope. My question is why the intensity profile intensity profile the...
  2. O

    Need help installing Metal Halide Lamp (Need UV)

    Hi all, This is about installing UV lamps so I guess I should post this in the Electrical sub-forum. I am actually looking for a short but power UV lamps with the purpose of polymerization of chemical monomer. My original search parameter of lamps: -Able to hit up to 25mW/cm2. -Total...
  3. C

    Calculating Resistance of 25W Lamp & Resistor in Series

    Homework Statement a) Bulb power is 25 W 24 V voltage. b) 25-watt light bulb and resistor, whose resistance is 19 Ω, connected in series and connected to 24 V DC voltage. In this case, passing within 0.71 A of current. Homework Equations a) Calculate the resistance of the lamp. b)...
  4. T

    Regulating/capping voltage for a lamp

    I'm working on a project for my model railroad and I would like some help. I have a locomotive with a DC motor that runs it. This motor is powered by a power supply that ranges from 0-12VDC to control the speed of the train. The DC motor can pull as much as 1.5A. Also in the locomotive is...
  5. R

    Reducing intensity of xenon lamp

    Hello Forum, An optics question here. I'm using a Xenon continuous arc lamp as a source of broadband light together with a spectrometer for an absorption experiment. However the lamp is too bright and is saturating the spectrometer. Is there a standard way to reduce the...
  6. R

    What Will Happen to a Lamp Connected to AC & DC?

    Hi, I am just thinking and i got doubt that if one wire carries AC(3V) and other wire carries DC(3V) and on the other side if you conntect together followed by a diode and last with one lamp. What will happen in that situation to lamp.
  7. T

    Tension in a string tied between a wall and a lamp suspended from the ceiling

    Homework Statement The owner of a small restaurant needs to move a table in order to have space for a new display. Ordinarily, a lamp of mass m is hanging over the table, suspended from a string attached to the ceiling. With the table in a new position, the lamp needs to be moved. To this end...
  8. K

    How Does a Helium Lamp Work?

    "In the helium lamp an electron from the discharge impacts on a He atom, ionises it and at the same time excites it to a superposition of several states. For simplicity, let us consider only the states that are of practical importance and assume that the He+ ion immediately after the impact is...
  9. A

    Fringe pattern of a vapour lamp

    Homework Statement Hi Please, what fringe pattern would be obtained with a sodium vapour lamp? Homework Equations The Attempt at a Solution I am guessing that a dominant yellow colour would be obtained. The sodium is almost acting like a monochromatic light and therefore has a...
  10. C

    Calculating Resistance of Resistor for 12V/10W Lamp & 24V Accumulator

    Homework Statement A lamp is marked 12V/10W. the lamp is connected to 24V accumulator. in series with lamp you must then connect a resistor. Calculate the resistance of the resistor. Homework Equations The Attempt at a Solution
  11. J

    Question about the starter of a fluorescent lamp.

    Question about the "starter" of a fluorescent lamp. Suppose the following circuit which is a simple fluorescent lamp. It consists of a "starter" connected in series to an inductor and this connected in parallel with the extremities of the lamp and to the voltages of the alternating current...
  12. B

    Sodium Vapor Lamp: Exploring Why We See Only Sodium Spectral Lines

    Hi Why do we have only sodium spectral lines in the sodium vapor lamp despite the very low concentration of sodium present in the lamp.
  13. O

    Pushing a lamp across a floor

    Homework Statement This is my first post on the site, so bear with me if this is a little unclear. A person wants to push a 7.2kg lamp across the floor. (a) Assuming the person pushes at a height of 60 cm above the ground and the coefficient of friction is 0.20, determine whether the lamp...
  14. C

    Fluorescent Lamp/ plasma experiment

    I have a undergrad college class where we have to do some sort of experiment and we were going to try this one http://mesoscopic.mines.edu/mediawiki/images/9/93/Microwave_flourescentlamp.pdf Is a vacuum chamber required? The article states it's inexpensive and we're trying to figure out how...
  15. C

    Xe Arc Lamp Safety: IR NIR Risk Analysis

    Hey all, When it comes to arc lamps, it looks like the safety concern everybody talks about is in regards to UV exposure. This, however, seems to be more suited for Hg sources instead for Xe sources. My question is in regards to whether there should be any concerns with the IR portion of the...
  16. A

    Need to preionize xenon lamp with somethingium

    We're building a very high power xenon flashlamp with electrodes so far apart that some kind of pre-ionization is necessary to start the discharge. I dump 10,000 volts across the electrodes so I just need a few loose electrons to get the ball rolling. I've been using a Tesla coil to get a...
  17. Q

    Electromagnetic radiation from a lamp

    Homework Statement What is the peak electric field E_0 at 1 m from a 100 W lamp. Assume spherically uniform emission Homework Equations Magnitude of Poynting vector S = \frac{E_0^2}{c\mu_0} And Power = S x Area (2) The Attempt at a Solution Sub for S from (1) in (2) and...
  18. M

    Illuminate Your Video Inspections with a 30/60Hz Strobe Lamp

    I need to illuminate a scene for a video inspection. Unfortunately it's a big scene and I don't have unlimited power. I though of using a strobe light triggered at 30Hz (or ideally 60Hz) and synced from the frame pulse of the video camera - so I get a bright pulse of light as each image is...
  19. R

    Calculating the Zeeman Effect: Na Lamp in 0.4T Magnetic Field

    Homework Statement I have problems with calculation of the Zeemans effect. A natrium lamp is being placed in magnetic field with B=0.4T. Calculate the Zeemans effect for the states 3s j=1/2 and 3 p j=1/2 The only problem i get in this calculations is the Landes factor...can get the right...
  20. K

    Filament lamp I/V characteristics lab problem.

    i have to have my lab report ready in the next 1 hour and i am stuck. in my experiment we had a varied power supply , an ammeter and a voltmetter both with small error (and digital). i have taken about 15 measurements of potential difference and its respective current. the circuit had in one...
  21. K

    Filament lamp I/V characteristics lab problem.

    Homework Statement i have to have my lab report ready in the next 1 hour and i am stuck. in my experiment we had a varied power supply , an ammeter and a voltmetter both with small error (and digital). i have taken about 15 measurements of potential difference and its respective current. the...
  22. B

    Diffraction: grating and sodium lamp spectrum

    Homework Statement Light from a laboratory sodium lamp has two strong yellow components at 589.5923 nm and 588.9953 nm. How far apart in the first-order spectrum will these two lines be on a screen 1.00 m from a grating having 10,000 lines per centimeter? Homework Equations Grating...
  23. G

    Calculating Cost of Operating Lamp

    Homework Statement Compute the cost per day of operating a lamp that draws a current of 1.90 A from a 110 V line. Assume the cost of energy from the power company is $0.0620 / kWh. NOTE: Enter your response with tenths precision. The Attempt at a Solution 1.90*110V*.0620*24 = .310992...
  24. K

    Lamp, p-n, nanotubes transistors

    I need a professional pure English literature at this field, can you help me via some links?
  25. A

    Understanding the Fire and Sustain Voltage of a Neon Lamp

    Dear we have been asked to devise an experiment to find the resistance of a resistor using neon lamp. Can some help me please i have to submit it in next couple of days. I know about resistance but have no idea of neon lamp. Please help me making lab report.
  26. R

    Calculating Photon Count from Xenon-Arc Lamp

    Hi all! Problem. I have a light source (xenon-arc lamp) and wish to calculate the no. of photons emitted. It seems that I have to use chemical actionmetry (Potassium Ferrioxalate as Chemical Actinometer)? I need to know the no of photons emitted at all wavelengths given out by the lamp at a...
  27. fluidistic

    How can I fix my fluorescent lamp's flickering and glowing issue?

    I apologize if the question is posed in a wrong forum. I've had a lamp similar to this one: http://upload.wikimedia.org/wikipedia/commons/4/42/Fluorescent_Lamp.jpg for about 2 years now. Ever since I bought it, when I turn the light off, every 30 to 50 s it emits flashes of light. One flash...
  28. M

    Calculating Tilt Angle for a Top-Heavy Floor Lamp

    I am trying to determine at what angle a floor lamp would begin to fall over(tilt over). The lamp has a rectangular base and is a little top heavy. Once i determine its CG, how can i apply force diagrams and mathematics to determine at what angle it would begin to tilt? I could increase the...
  29. S

    Can an antenna work as a lamp?

    If Light is EM wave, and antenna can emit EM wave, then can an antenna emit light? Is this a matter of designing the antenna correctly or is there something fundamentally wrong about this reasoning?
  30. C

    What happens to a lamp in series if lamp in parallel is broken?

    Homework Statement I'm looking through some old IB exams, and I came across this (supposedly fairly easy)question. I'm having some problems, and I feel there's something really basic I'm missing. http://img52.imageshack.us/img52/5139/physicsproblem.jpg...
  31. 1

    Davy's Safety Lamp: How Does it Get Oxygen to Burn in Coal Mines?

    Hi there! (It's not actually a homework question) I just wanted to ask where does the lamp get oxygen to burn on in coal mines. So there must be an inlet for air. Of course it is explained in my book that as the wire mesh distributes the heat therefore the temperature does not rise to the...
  32. H

    Why can't sodium vapour lamp be used in spectrometer experiment

    i was working with a spectrometer and the aim of the experiment was to find the refractive index of a prism for various colors. i was asked specifically to use mercury vapor lamp and was insisted not to use sodium vapour lamp. why is it so?
  33. S

    "Understanding Fluorescent Lamps and Their Processes

    Homework Statement Fluorescent lamps use phosphors to produce visible light from UV light. This is done by absorbing the UV light and then re-radiating it using a different wavelength. This is a a. one way process b. reversible process c. process that produces continuous spectrum d...
  34. G

    Energy savings lamp produce heat so what?

    I bought an energy savings lamp. The white wall really looks like daylight, but the bananas look green! I suppose it's impossible to recreate all colour impressions simultaneously without recreating the complete Planck spectrum. My question is: Why don't they allow normal light bulbs (in...
  35. M

    AC emf applied to capacitor and lamp in series

    Homework Statement Hi, I found the following example in a high school physics book about electrical circuits. There's something about the example that I don't get, so I hope you can help me out. I give you the example text and the solution, and then I explain what I don't understand...
  36. N

    Why Do Compact Fluorescent Lamps Striate When Connected to Dimmer Circuits?

    We have Compact Fluorescent lamps hooked up to a dimmer circuit, and they are striating (flashing) at exactly the same frequency, even at full power setting, which tends to tell me it's circuit related. Now I know that a dimmer circuit uses a triac to chop up the waveform, and therefore we're...
  37. P

    Calculating Lamp Resistance & Voltage for 18W Tubelight

    how to calculate lamp resistance and lamp voltage to light up a 18W tubelight?
  38. E

    Specific parts of the emission spectrum of a sodium lamp

    Homework Statement Part a) The emission spectrum for Sodium lamp contains a reasonably bright red line in its spectrum. What is its origin? Part b) The possible transitions between electron energy levels for Sodium were analysed. There were no transitions between the s series (s subshell)...
  39. K

    Lighting up a fluorescent lamp with a Van De Graaf generator

    Hi all, Let's say i have the following: I approach a charged-up VDG holding a fluorescent lamp. The end nearest the VDG is labelled A and the end furthest away from the VDG is labelled B. My hand is holding the lamp in the middle, i.e between ends A and B. The region inside the lamp...
  40. C

    Lamp Brightness in Parallel Circuit

    I'm looking at a problem where a battery of negligible internal resistance is connected to two lamps L and N in parallel with each other, then through in series to a 3rd lamp M. The question asks if the filament of one of the lamps in parallel N breaks then what happens to the brightness of the...
  41. C

    How Does Elevator Motion Affect the Tension in a Suspended Lamp's Wire?

    Homework Statement A 3.0-kg lamp is suspended by a wire from the ceiling of an elevator. What can you conclude about the tension in the wire under each of the following circumstances? (Give a numerical result, or a range of possible numerical results, or if you can’t conclude anything...
  42. B

    Bedside Lamp with a mind of it's own

    Last night i awoke in the middle of the night to find that my bedside lamp was on. How is this possible? I don't remember turning it on myself and it's not a touch lamp. It really freaked me out. Is there anyway that it is in fact possible for it to have turned on?? Any help would be...
  43. M

    Why Does a Sodium Vapor Lamp Create a Dark Line at 589nm in the Spectrum?

    Homework Statement i understand that the wavelength given off by a sodium vapor lamp is 589nm, is this why there is a dark line in the continuous spectrum at 589mn? Homework Equations The Attempt at a Solution
  44. S

    Find the resistance of the lamp

    Homework Statement Two 1.50 V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.255 ohms, the other has a resistance of 0.153 ohms. When the switch is closed, a current of 600 mA...
  45. S

    Selecting a Lamp to Achieve 500 Lux on 12mX0.5m Surface at 25-30m Distance

    I do not know if i am in the right place to ask this question but i am trying. I need to select a light source so i can achieve a 500 lux on surface of 12mX0.5m, but the problem that i must put the source on a distance of 25m to 30m. I tried to search for light sources but the problem that...
  46. C

    Learning is ‘Scuba with a Lamp’

    Learning is ‘Scuba with a Lamp’ I moved to Dallas in 1980 and decided to learn scuba diving. I took a YMCA scuba class and after completing the class joined, with many fellow members of my class, a dive club sponsored by the Y. We shortly thereafter took a one week dive trip to Mexico...
  47. P

    Bicycle Dynamo Light Circuit: Understanding the Wiring and Functionality

    Hello! I have one question. How the circuit of the dynamo light of bicycle is closed? Isn't the coil got two wires, one from the start, and one from the end. Thank you. Regards. Here is one picture: http://www.windpower.org/kres/dynbde04.gif
  48. B

    Calculating Watts in a Day/Second for Lamp with 60W Capacity

    Hello, I'm having problems with this question. I'm not exactly sure how to determine how much watts in a day, or in a second the lamp takes. Homework Statement Theres a lamp that absorbs 60 W when connected to a 120-V source. Q: Find the cost of operating the lamp for 24 hrs when...
  49. D

    Electrical characteristics of a lamp. Experiment.

    [SOLVED] Electrical characteristics of a lamp. Experiment. GCSE Science... Electrical characteristics of a lamp. The Aim is to investigate the relationship between current, voltage and resistance in a lamp. Method: 1) Set up the circuit as in the diagram (with three cells) 2) Set the...
  50. L

    Voltage Drop Across Indicator Lamp

    Hi, I am new here so please bare with me. I know a bit about electrical and Electronics but I do not recall the formula for this application...it is a long question..please help! Here it is. Six cells are connected in series to form a battery. Each cell has a rating of 1.5 volts and 1 amp...
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