in which 220-v light bulb does the filament have greater resistance, a 60-W bulb or a 120-W bulb?
155881
Watts are directly in realtion to Ohms, hence a 120 watt bulb should have more Ohm resistance. The resistance in the fillimant is what creates the heat and light of the bulb, by friction of electrons or something along those lines.
316405
If your talking about regular incandescent bulbs in residential lighting fixtures, then its just the filament size and material that produces different levels of brightness.  For a given bulb, if you want to make it brighter/dimmer you can lower the voltage applied to the bulb.  Regular bulbs run on 120 volts.  There are dimmer switches for home lighting that get installed in the wall, but you can also get certain extension cords that have a variable resistor built in to allow you to control the voltage applied to the bulb, thereby affecting the brightness.
765230
EER = Q in (BTU/hr) divided by W in (watts)\n\n600/500= 1.2
846673
The light bulb uses energy and the energy after a while get hot. If you touch 650 watt or higher it will burn out like that, because the chemical in the bulb are keep the filament on the wire because it get way too hot. The Chemicals get use to your body heat and cool down real fast. It leaves a real cool black/grey bump on it but those bulb cost 20$$ each. They are make for lights that need to be on for a while or need to last for a long time, light street lights.
35547
By definition, a watt is "the SI unit of power. Power is the rate at which work is done, or (equivalently) the rate at which energy is expended."\n\nA 50-watt bulb is expending energy at 1/2 the rate of a 100-watt bulb.\n\nSo - if both are shining (not "shinning") for the same amount of time, the 50-watt bulb would use 1/2 the energy of the 100-watt bulb.
775688
Hmmm, curious.\n\nIf the bulb has a filament you can see, then yet, it will almost certain be dimmable.\n\nI cannot see why there would need to be a trasformer in the box, if you try and wore the lamp in series with a 400Watt rated dimmer, th e worst that is likely to happen is you kill the dimmer.\n\nTry and find a bit more about this (make/model/type) and pop up another question, we can then give better feedback
814978
The resistance of the filament will increase as it heats up. So you're going to get something called a "transient", which is when the initial value will stabilize (to the working current in this case), after a period of time.\nA lower starting resistance equals a higher starting current.
932209
Basic-   15 amp circuuit should not hold more than 1440.00watts, or 12 amps ( 1440watts / 120v= 12 amp).  you should load the circuit for lighting or continual use more than 75%.  the same for 20 amp circuits. (1800 watts/120v=15amps).   Check the back of the space heater. It should the watts listed.
1088792
Do you mean ac-dc adapters?\nif so, they transform the current, one to the other to allow different devices to work\nFor example, dc gives too strong power for delicate circuitry, so it must be converted to ac\n\nMore info:\n1)        How to find correct Voltage Converter ?\nTo determine the right voltage converter for your appliance, first find out the voltage (110 or 220 Volt AC) and wattage rating (watts or amps) information on the back or bottom of the appliance or from instruction book of an appliance. If no watts are shown and only amps are shown, multiply the volts (input AC) by the amps to find the watts.\nFor example,\n\nVolts(AC input) x Amps(amperage) = Watts (Wattage)\n110V x 0.5A = 55W\nNote: voltage converters or transformers do not change cycles (50Hz or 60Hz)\n\n(go to top)\n\n2)        What does voltage converter/ transformer mean?\nVoltage converters/transformers are used to convert electricity. North America and some other countries operate on 110V/120V AC 60Hz, while most of other countries operate on 220/240 volts AC 50Hz. Voltage transformers convert the power into different voltage, so your equipement can be powered at different countries without being demaged.\n\n(go to top)\n\n3)        What does "step-up/down transformer" mean?\nStep-up/Down transformers are used to convert electricity from 220V/240V AC to 110/120 V AC (step down) or 110V/120V AC to 220V/240V AC (Step-up). These type of transformers are grounded and with build-in fuses, which provides safety against electrical shock and demage.\n\n(go to top)\n\n4)        How do I figure out how many Watts voltage transformer do i need?\nYou need to check how many Watts your applience operates on (You can find this information on a label on the bottom or back of your equipement, or in the manual). If you can't find this information, you can try to find information on amperage (AMPS) of your appliance and multiply it by input voltage (110V or 220V) to arrive at the total wattage.\nVolts x Amps = Watts (i.e 110V x 0.5 AMPS = 55W). Please make sure not to run any applience with higher wattage then woltage transformer's wattage. This might demage both: your applience and the transformer! Heavy duty transformers/converters can be used continously at 17%-80% of their wattage capacity.\n\n(go to top)\n\n5)        Will my appliences from overseas work in U.S. and vice versa?\nYes, as long as you get one of our voltage transformers/converters. Consider buying a higher wattage transformer then the wattage rating of your applience. Please, refear to the question above to figure out what type of a converter do you need. Please remember that transformers don't convert cycles! Some cycle sensitive appliences (like microwaves, stereo turn tables and analog clocks may not operat properly. However, most modern electronic equipement is not affected by difference in cycles (computers, printers, mini systems).\n\n(go to top)\n\n6)        Can I use several appliences at once on the same voltage converter /transformer?\nYes, as long as total wattage of all your appliences does not exceed the wattage capacity of your transformer/converter. Try to set up your transformer to run at 80% of its wattage to avoid demaging your appliences by power flunctuations.\n\n(go to top)\n\n7)        What is the difference between AC/DC adapter?\nMost of the countries use alternating currents (AC). DC stands for direct currents. All appliences and voltage transformers run only on AC electricity.\n\n(go to top)\n\n8)        Does the plug shape make the difference, when using my appliences and voltage converter/transformer overseas?\nThere is no worldwide standards for the plug configuration. Plugs, plug shapes, electric outlets differ from country to country. For that reason you need to get a plug adapter, in order to plug your aplliance into foreign electric outlet. You still need a voltage converter, otherwise you might demage your applience or cause fire!\n\n(go to to
149476
This is my best guess based on a familiarity with the issue, but please don't take this as definitive.  I just wanted to give some answer as noone had as of yet.  \n\nAs I understand it, Edison used a voltage of 110 in his original DC systems after finding experimentally that it was the highest voltage that would illuminate his carbon filament bulbs enough to beat gaslight without burning them out too quickly.  Exactly what was considered "too quickly" I don't know.  \n\nThe first AC systems adopted the 110 V standard, although Nicolai Tesla, who developed such systems for George Westinghouse, wanted to use a higher voltage, 240 V.  \n\nLater, when some electrical systems switched to a higher voltage, they went with a multiple of 110 so as to make it easier to tap into one phase of the voltage to get the old 110 V potential back.  This is essentially what we have in the US.  We have 220 V service to our homes, and a few of the appliances that consume a lot of power, such as clothes dryers and AC systems, are wired to that, but the rest of the outlets are wired for 110.
975896
Energy is measured in watts, so I assume you mean a voltage source of 200v.\n\n(1)\nThe voltage source of 200v applied to the light bulb (laminar) will be 200v.  Since the light bulb is designed for 130v, the supply voltage will likely blow the bulb.\n\n(2)\nHere you have two possibilities, depending on your circuit.\n(a) If you have a parallel circuit, then each light bulb will have 200v across it, and again the bulbs will likely blow because the voltage is to high.\n(b) If you have a series circuit, the voltage across the light bulbs will be subject to their resistance.  Assuming the resistance is the same, then the voltage will be the same, that is, 100v each.\nThe voltage across each light bulb will be equally proportional to it's resistance ratio.
827565
The voltage readings on the light bulbs are not what they definitely operate in, but optimim values. What is constant is their resistances, and connecting a larger voltage to a lower valued bulb will increase the current across it, and there is a possibility that this will burn the bulb.\n\nHowever, if you connect several bulbs in series to a higher voltage source, i.e. 3, 3, and 6, to a voltage source of 12 V, they should all be within the optimim values.\n\nGenerally speaking though, the bulbs in your example should still be ok (although they will shine much more brightly) unless you connect them in parrallel. (a volmeter across them would probably read about 4V and 8V if you connect them in series)
333276
This is a little too complex a question for free answers.  But:\n\nLower NUMBERS in gauge correspond to larger AREA of the wire cross section.  The larger the area, the more amerage can be safely carried by the wire.  Voltage is not really an issue at common household voltages, as most modern wire is rated to 600V and household doesn't exceed 220V.\n\nIn-wall wiring is solid copper.  You will generally match the wire gauge to the circuit breaker size as follows:\n\n14 gauge = 15 amp breaker (15 amp max)\n12 gauge = 20 amp breaker\n10 gauge = 30 amp breaker\n\nThe use of watts is misleading; it's AMPS that matter.  But watts * volts = amps, so you can deduce amerage from reading the wattage value, and knowing the current in your home.  The in-wall wiring specs are not generally limited by wire LENGTH, at least not in the way extension cords are.\n\nExtension cords, unlike in-wall wire, are not solid copper.   However, they're also less likely to burn down your house.  They are rated by wire lngth and gauge.\n\nYou can use the links I've provided here to see required gauge sizes.  Most indoor space heaters are 1500 watts (about 12 amps) though  some are 1750 amps.
171175
P=IV\n =12.5*120\n =1500W\n =1.5KW
579320
Turn it off.\nA watt measures power, not energy. Power is the rate of using energy.\nEnergy is measured in joules.\nOne watt is one joule per second. \nA 100 watt light bulb uses 100 joules per second, or 6,000 joules per minute or 360,000 joules per hour.\n\nNow how much energy do you think it takes to turn on that bulb? An hour's usage? And how fast does it use it? All in the first second? If it really did used 3600,000 joules in the first 1 second, that would be 360,000 watts. That would definitely blow your circuit breaker. Does the bulb use one minute of power in the first second after you turn it on? If so, that would be 6,000 watts, which still blows your breaker. Most household circuit breakers trip at 15 to 30 amps, which is 1,800 or 3,600 watts on a 120 volt circuit.\n\nSo turn off the light.
94366
Check your local Home Depot.  40 watt is the 4' bulb with the plant/aquarium label.  (appx $7).  get an inexpensive 4' single bulb fixture with cord and pull chain on/off (appx $8).  If you want rapid start, i believe you're just wanting something that doesn't take a long time to come on.  Just ask if is has a magnetic ballast or a rapid start ballast.  For a few dollars more get an electronic ballast and drop down to a 32 watt T8 bulb, which will cost a little more initally, but it will last longer, reduce energy costs and turn on and off like an incandescent bulb.  One warning though, don't use these around reptiles.  The frequency that these ballasts and bulbs operate at creates a strobe effect to reptiles and will drive them insane.  Consult a pet store if you're looking for something to use around reptiles.
481822
1.80 or 120\n2.bcuz u need 1 to hold the lightbulb, and 99 the rotate the house. lol im a blonde! =-)\n3.One says "cockadoodledoo" and the other says "any cock'll do"