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# How many joules of energy does a 100Watt light bulb use per hour?

345 ###### 2013-11-09 18:54:20

It's 100 watts times 3600 seconds, that's 360,000 joules of energy. A joule is 1 watt for 1 second.

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## Related Questions there are 100 joules in an energy efficient light bulb 75 joules go towards the light and 25 joules go towards the heat 60 watts means the same as 60 joules per second. This is the energy used; all of the energy will be given off by the light bulb (but not all of it will be radiated as visible light).60 watts means the same as 60 joules per second. This is the energy used; all of the energy will be given off by the light bulb (but not all of it will be radiated as visible light).60 watts means the same as 60 joules per second. This is the energy used; all of the energy will be given off by the light bulb (but not all of it will be radiated as visible light).60 watts means the same as 60 joules per second. This is the energy used; all of the energy will be given off by the light bulb (but not all of it will be radiated as visible light). 1) The power use of bulbs is specified in units of power, not energy. In other words, watts - which means joules per second. 2) Light-bulbs come in different capacities. 3) It is incorrect to say that the energy (or power) "is in" the light-bulb. The light-bulb simply transforms one type of energy to another, using electrical energy which is NOT stored in the light-bulb.  welll it really depends on the volasity of light energy but from my calculatios it is 900  Faster than ambient left alone? If compare to open air then it is faster with extra heat source of 100 Watt. If it had twice the bulb then it is faster than 1 bulb. Light bulb is the energy source and evaporation require energy. Provide extra energy help speed up evaporation. In the sense of 'work' as force moving through a distance, a light bulb does none of that. But in the sense that mechanical work is equivalent to energy in other realms, the 75-watt light bulb consumes 75 joules of electrical energy every second, and radiates 75 joules per second of energy in the form of light and heat. A Watt is a Joule per second. Joules measure energy and Watts measure power, which is the rate of energy used. Therefore, if you use a 60 Watt light bulb for 10 seconds, you consume 600 Joules.  "60 watts" means "60 joules every second". That's what a '60 watt' bulb is designed to consume. If you put 100 joules of energy into a light bulb, 100 joules of energy are going to come out of it, one way or another. Either that energy will be converted into light and heat by the bulb's filament, or else it won't get consumed at all, and it'll come out the other side of the bulb and still be available for use in some other device. So, comparing output energy to input energy is not an effective way to evaluate the efficiency of a light bulb. What you need to do, in order to compare the economy and effectiveness of light bulbs, is to compare LIGHT output to input ENERGY. Yes A 100watt light bulb left on for 10 hours will use a much electricity as a 1 Kilowatt fire left on for one hour. An energy efficient light bulb giving out the same amount of light as a 100watt bulb, only actually uses 20watts of electricity. That is 1/5th of the electricity, it will need to be on for 50 hours to use as much as a 1 Kilowatt fire left on for one hour. This will reduce your electric bill but the bulbs are more expensive than old 100watt bulbs (but the energy efficient bulbs last 6-8 times longer! so this balances out). Power = energy / time, in SI units: watts = joules / seconds. Solving for energy: Joules = watts x seconds. Just multiply the power by the time. The answer is in joules.  Power = Energy/time 100W=Energy/360 Seconds Energy = 100/360 Energy &asymp; 0.27 Joules Watt means joules/second. It refers to the amount of energy a device uses, in this case. Multiply the power (in watts) by the time (in seconds) to get the energy (in joules). 1 Watt means 1 Joule per second, so 60 watts means 60 Joules per second. A light bulb that burns energy at that rate for 3 seconds uses 180 Joules. The light bulb will use electrical energy at the rate of 60 W (60 J/s), and it will emit that energy, also at the rate of 60 W.Note that in any real light bulb, only part of the energy is emitted as visible light. The remainder is mainly heat.  That depends on the power used by each light bulb. Look at the specifications for a specific light bulb, then multiply the power by 10. Note that energy = power x time; that is to say, the energy spent by a light bulb depends on its power, but also on how long you keep it on. Specifically, watts = joules x seconds. Mechanic energy is converted in to light bulb , in bulb the electric energy converted into heat and light In a light bulb, electrical energy is transformed into light energy and heat energy. If the 60-W lamp is operating at its rated voltage, then the amount of energy it is using is 60 joules every second. Energy does not happen. Electrical energy is routed through a light bulb, and some of it is converted to heat energy and light energy inside the bulb.

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