The power rating of light bulbs tells how much electric energy in watts the bulb consumes when burning.
As an aside, a rule of thumb for estimating how much you are paying to burn a light bulb for a year, the number of watts equals the number of dollars. So if you burn a 40 watt bulb for a year it costs about $40. If only at night cut that in half and say it costs $20. If you burn 5 of the bulbs all year it's $200
That means how much power the light bulb is consuming all the time when it's on.
Incandescent lightbulbs have one wattage rating, but the new CFL and LED lightbulbs have two wattage ratings:
Watts are units of power. In simplified terms, power = voltage x current. So if a 120W light bulb is plugged into a 120V standard outlet, it will draw 1 Amp of current (120W = 120V x 1A).
It describes the amount of electric power the bulb uses.
The number of watts (= energy per second) consumed by the bulb when lit.
The power; the rate of how power is converted from electrical energy to light and heat energy.
It stated the amount of energy that the bulb will consume when the bulb is in operation.
The power it consumes
the higher the wattage is the hotter it gets
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.
Also CFL and LED light bulbs use much less actual wattage than their equivalent wattage. It is best to look at the datasheet for each individual type of light bulb. They can vary from milliwatts to kilowatts, depending on the purpose the light bulb was intended for.
No, only the resistance of the filament counts (normally marked as "wattage" on the bulb).
Yes, in fact that is what a rough service bulb is rated at. The bulb used on a 120 volt system will have a reduced wattage output as to what it would be on 130 volts.
lower wattage bulb
The wattage will depend upon the type of bulb and the number of lights on the string. It will tell you on the package what each bulb requires in wattage, so you only need to multiply that by the number of bulbs in the string. so, number of bulbs x wattage requirement for each bulb = wattage requirement.
The wattage of bulb one uses in a bedroom lamp depends on several factors. If it is a lamp used for back ground lighting or a night lamp, one would use a very low wattage bulb. If it is for a bedroom reading lamp, one would want a stronger wattage. The biggest factor on deciding what wattage to use is the wattage suggested by the lamp manufacturer. All lamps are marked with recommend bulb wattage.
No, a fluorescent bulb does not emit the same amount of heat as a metal halide bulb of the same wattage.
15 watts
21 Watt
Yes, as long as the voltage is the same and the bulb has the same or less wattage. The fixture is rated at a certain wattage that can be found on a label somewhere on the fixture. Never use a larger wattage than what is stated on this label.
You can use a lower wattage bulb on a higher wattage fixture provided the voltage rating is the same and the bulb base is the same.
Most equate wattage with the amount of light a bulb will put out. But, the wattage is the result of the resistance of the element and the voltage and is the amount of heat. the frequency is unrelated.
No, a higher wattage INCANDESCENT light bulb uses more current than a lower wattage INCANDESCENT light bulb. Some CF and LED bulbs are rated by the amount of light that an incandescent bulb would produce, but they are also rated by the wattage that they use.
the bulb is usually 30 or 40 watts
The brightness of a light bulb directly has no direct relationship with magnets and wire. The bulbs brightness is determined by the wattage of the bulb. The higher the wattage of the bulb the brighter the bulbs light output.