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Answered 2010-03-10 02:24:52

Use the formula P= VI (power = potential x current) where (watts = volts x amps).

The current I in amperes is equal to the watts divided by the volts, 40/120.

The bulb is using 1/3 amp of current.

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A 100W bulb running on 120VAC will draw 0.833A or 833mA (milliamps) of current.


current=power/voltage current=80/120=0.667A


It would light a 9-volt bulb correctly. It would also light a 12-volt bulb at reduced brightness.


If you want your bulbs to last longer then use 130 volt bulb on a 120 volt system. The light emitted by a 130 volt bulb, when comparing it to a 120 volt bulb, will be a bit dimmer.


Assuming that the bulb is a 120 Volt rated bulb, I=P/E=60/120=.5 Amps. Where I=current, P=Watts, and E=Volts


12 volts is enough for a 12-volt 100-watt light bulb. It would not be enough for a 120-volt or 240-volt bulb.


The bulb with the lowest resistance. Current = Volts / Resistance


current.....(A)....u gotta tell me the resistance (Ohms). Then, A (currrent) = V(volts) divided by R(resistance) loll i just had a science test on this today


Is the bulb a 1.5 volt bulb? A 3 volt bulb? A 12 volt bulb or a 120 volt bulb?Or does it have some other voltage such as 230 volts which is very common in Europe and many other countries of the world?What is the wattage of the "big light bulb"?This question cannot be answered without knowing at least the voltage and the wattage of the light bulb that is being asked about.


Voltage is equal to current over resistance. V=I/R which means that the resistance should be .0069167 ohms.


There is no universal answer, check the specifications on the box the light bulb came from, as a 120 volt light bulb can come in different watt amounts.


Yes it it is a 12 volt DC light bulb. It will not operate a household 120 volt light bulb.


If the light bulb is rated at 9 VDC connect it across the 9 volt source. If you are talking about a ordinary household light bulb it will not light up. The resistance is too high in the bulb to see any light emit from the filament A 100 watt bulb's resistance is about 144 ohms. On 120 volts, filament current is .83 amps. On 9 volts, the filament current is .06 amps. It is about 14 times less current than what is needed to make the bulb glow at its rated wattage.


The 130 volt light bulb will last longer in use but some of these types of bulbs do not give out the same light output as do 120 volt bulbs.


Yes a 220 volt light bulb will run on a 120 volt circuit but at 1/4 of the wattage that the light bulb is rated at. A 100 watt light bulb on 220 would would be equal to a 25 watt light bult on 120 volt system.


No, a light bulb rated to work in a 120 volt lamp will not work properly in a 12 or 24 volt low volt lighting fixture. I don't believe it will harm the fixture. If you did get a 120 volt light bulb to fit into a low voltage light it would probably just be dim.


A light bulb cannot be charged. A 12 volt incandescent bulb can be used with a 6 volt battery, but the lumen output will be slightly less than half. Better to use a 6 volt bulb or two 6 volt batteries in series.



The current will increase by a factor of 6 times, and the light bulb will be brighter, and may burn out quickly.


No, the higher voltage will cause the bulb to burn out instantaneously.


A 13.5 volt bulb will burn less brightly but last longer.


the 220 volt bulp in 220 volt ac current


Yes, you can easily use it. Just install it as you would any other 120 volt light fixture and change the bulb from a 240 volt bulb to a 120 volt bulb. It will work just fine.


Only for a period of time much shorter than 1 second.


Volt (V) = Resistance (R) times Current (I) therefor R = V / I 30 Ω = 3V / 0.1A



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