## How much fuel does it take to power a lightbulb

HOW MUCH ENERGY-WHETHER ELECTRIC, COAL, NUCLEAR, OR OTHERWISE-IS REQUIRED FOR A 100-WATT LIGHTBULB TO RUN FOR A YEAR, 24 HOURS A DAY? HOW MUCH FUEL DOES IT TAKE TO POWER A LIGHTBULB FOR A YEAR? Kilowatt hour (kWh) = unit of energy equal to 1000 watt hours A 100-watt light uses 0.1 kilowatt hours worth of energy How much energy does an electric 100 watt lightbulb use a year? 0.1 kW x 8,760 hours in a year = 876 kWh (kilowatt hours) WIND COAL O 15 megawatt turbine x 365 days x 24 hours x 25% capacity = 3,285 mWh = 3,285,000 kWh O 876 kWh- 3.285,000 kWh/year = 2.67 x 10 years O 267 x 10ʻyears = 2 hours 20 minutes 9 seconds 1.5 MW turbine operating at 25% capacity 714 pounds O Burning one ton of coal creates 2,460 kWh o of energy. for 2 hrs, 20 min 9 sec. * 876 kWh+2,460 kWh/ton = 0.357 tons O 0.357 tons = 714 pounds BURNED COAL SOLAR NUCLEAR the, 8 days 18 hrs 14 min 24 sec. on 100 square meters of solar panels * 1 pound of the uranium 235 isotope can produce 10.246.469 kWh of energy O Assuming a yield between 20-25% (average solar convertion efficiency). a one square meter solar panel can produce 1 kWh of energy in a day .035 pounds O 876 kWh+10.246,469 kWh/pound = 8.5 x 10 pounds O 100 one square meter panels producing 100 kWh would require 8 days 18 hours 14 minutes and 24 seconds NATURAL URANIUM O Divide this by 35 (the average thermal efficiency of uranium 235 is only 35%) = 2.4 x 10pounds O Divide this by .007 (uranium 235 isotope needed for nuclear fission makes up only .7% of raw uranium) = .035poundof natural uranium. HYDROELECTRIC NATURAL GAS O The power of a hydro-electric turbine = (height of dam) x (river flow) x (efficiency) + 11.8 (converts units of feet and seconds into kilowatts) * Assuming: dam height(10 feet) x river flow(500 ft' per second) x (80% efficiency) + 11.8 = 339 kW turbine 339 kW turbine operating at 80% efficiency O 876 kWh + 339 KW = for 2 hrs and 35 min. 2 hours and 35 minutes 143 pounds 1 poundbf natural gas can produce 6.12 kWh of energy O 876 KWh + 6.12 kWh/pound = 143 pounds of natural gas with 500 ft' of water per second falling from 10 ft. NATURAL GAS ALL CALCULATIONS ARE BASED ON SAMPLE CONDITIONS, AND ARE INTENDED TO PROVIDE INSIGHT IN BROAD COMPARISON, ACTUAL ENERGY OUTPUT VARIES SITUATIONALLY. SOURCES: PHY.SYR.EDU SOLARPANELMANUAL.COM A COLLABORATION BETWEEN GOOD AND COLUMN FIVE HOWSTUFFWORKS.COM WIND-WATCH.ORG NEW.WVIC.COM

# How much fuel does it take to power a lightbulb

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