Science

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Algebra

Light Bulbs and Artificial Lighting

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there are 100 joules in an energy efficient light bulb 75 joules go towards the light and 25 joules go towards the heat

A light bulb consumes watt-hours per day. How many watt-hours does it consume in days and hours?

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.

Joules (energy) are not equivalent to Watts (power).If something converts 6 Joules every second, it is 6 Watts. If it takes ten seconds to convert 6 Joules, its power is 0.6 Watts.Multiply the Watts by the seconds to find the Joules.CommentYou do not 'consume' power. Power is simply a rate; you cannot consume a rate! You consume energy; the rate at which you consume it is power.

Convert the 100 watts to kilowatts. Calculate the total time in hours, and multiply by the number of kilowatts that the light bulb uses.

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).

It stated the amount of energy that the bulb will consume when the bulb is in operation.

Let's assume that this is an incandescent bulb with a light efficiency of 35 percent ... i.e. 35 percent of the electric power it consumes is converted to light, and the other 65 percent becomes heat, which the bulb then dissipates into the room. So the bulb is dissipating heat at the rate of (0.65 x 40) = 26 watts = 26 Joules per second. 2 hours = (2 x 3,600) = 7,200 seconds 26 joules per second x 7,200 seconds = 187,200 Joules of heat

"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.

first you have to conver 4.3 hours into seconds, which is 15480seconds and then you multiply that by the power which is 60 W, which then you get 928800 Joules

It uses 60 joules of energy every second, which is 60 watt-hours or 0.06 kilowatt-hours every hour.

Every second a 150 Watt bulb converts 150 Joules from electricity into heat and light. The number of Watts tells you how many Joules pass per second.

The light bulb. The light bulb. The light bulb.

Your question is rather like asking "How many miles per hour do you do in a week?" You don't consume watts over time, it's a measure of how many joules of energy you consume over time.

A 0 Watt bulb does not consume electric power so the cost is zero.

The average life span of a light bulb being on 8 hours a day is 2000 hours.

5 joules? I'm not sure...

13500/3600= 3 days and 3/4 of a day

100 joules/second = 100 watts.

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).

The 60 watt bulb will consume less energy and not be as bright as a 100 watt bulb. Most bulb sockets will specify a recommended bulb rating.

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.

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.

Thsi depends on the light bulb specification. For example if you buy a standard 60W light bulb from your supmarket then this will consume 0.06kilowatts. Its simple just divide the wattage stated on the light bulb by 1000 to give you the kilowatts

An electrical watt is a measure of power. A 40 watt light bulb uses 40 watts of electrical power. It has a relative measure of twice the light output of a 20 watt bulb and one half the output of an 80 watt bulb. A 40 watt bulb uses 40 Joules of energy each second, or 40 watt-hours of energy each hour. In 1000 hours it uses 40 kilowatt-hours or Units of electrical energy.

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