how much energy is needed to power a light bulb?
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Incandescent: A 100-watt, classic light bulb running for a full year would use up 876 kWh of energy. This means a full year of running one incandescent bulb would cost $131.40.
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This is how much electricity the night light will use when it is on. Typical incandescent or neon night lights use about 1.5 to 7.5 watts of energy. LED and electroluminescent night lights can use less than a single watt.
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Calculate the kWh use for each appliance. The formula for kWh is watts multiplied by hours used and then divided by 1000. For instance, a 100-watt light bulb used for 10 hours would use one kWh. Add all of the kWh totals from your appliances to get an idea of your electrical load that you use every day.
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Zero watt bulbs consume 12-15 watts of power. However, in older days, when all the appliances were turned off and only the zero watt bulb was kept on, the 'not so sophisticated' electromagnetic meter could not measure power of such less magnitude.
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Pedaling a bike at a reasonable pace generates about 100 watts of power. That's the same energy-per-time used by a 100-watt lightbulb. So if you pedaled eight hours every day for 30 days (no weekends off), then doing the math, you'd generate 24 kilowatt-hours (kWh) of energy.
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Incandescent bulbs work by heating a filament wire to the point that it glows. Because incandescent bulbs are powered by 120 V, 60 Hz AC voltage (50 Hz in some countries) we might expect to see a 60 Hz (50 Hz) modulation of the light as a result.
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It might also depend on the time of the day or the season in which you use your lights. If you have an electric rate of 20 cents per kilowatt-hour, then you can save about 1.2 cents when you turned off a light bulb per hour.
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So, just multiply the watts times the hours used to get the watt-hours. (Then divide by 1000 to get the kilowatt-hours, which is how your utility charges you.) Example: 100-watt bulb x 2 hours ÷ 1000 = 0.2 kWh.
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Watts to Lumens – Energy Output to Brightness Produced Here is a breakdown of traditional watt light bulbs and the amount of light they produce in lumens: 40-watt bulb produces 450 lumens of light. 60-watt bulb produces 800 lumens of light (most widely used in households)
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Lighting accounts for 15 per cent of a typical household's electricity bill. You can cut your lighting bill and energy use by changing which bulbs you use and how you use them.
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One kilowatt is equal to 1,000 watts. Your electricity company charges by how much electricity you use per kilowatt hour (kWh). To put it simply, this means it measures the number of kilowatts you use over time. For example: A 100 watt light bulb uses 0.1 kilowatts each hour.
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With newer light bulbs designed to use less energy, wattage is no longer a reliable way to gauge a light bulb's brightness. That takes lumens. Lumens measure brightness. A standard 60-watt incandescent bulb, for example, produces about 800 lumens of light.
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Most computers are built to use up to 400 kilowatts of electricity per hour, but they usually use less than that. The average CPU uses about as many kilowatts per hour as the typical light bulb.
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Electricity usage is calculated in kilowatt-hours. A kilowatt-hour is 1,000 watts used for one hour. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour. Below are some examples of electrical appliances found in most homes.
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So a 100-Watt bulb if kept on for 10 hours will consume: 100 x 10 = 1000 Watt-Hour = 1 Kilowatt-Hour (kWH) = 1 units (on your meter).
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Assuming most of this energy leaves us in the form of heat, I calculate that on average we radiate ~350,000 J of energy per hour. Since Watt is just Joules per second, this is roughly equal to energy given off by a 100 Watt light bulb!
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If you have a 60 spotlight on for 14 hours at full power, and a 16W UV tube for 14 hours, the total power = 74. or 1.036kWh which is also 1.036 units of electricty. If electricity costs 12p per unit and you use 1.036 units per day then your running costs will be about 12p per day.