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What uses more energy, making coffee or 6 hours of using a laptop computer? This worksheet shows the steps needed to calculate the energy use of making coffee compared to running a laptop. You can watts hours of use Electricity use with a coffee maker, 15 coffee maker 900 0.25 minutes of run time Electricity use with stovetop, 5 minutes electric burner 2500 0.083 of use to boil water Electricity use of a laptop under heavy laptop 45 6 use Data Sources http://michaelbluejay.com/electricity/howmuch.html How much electricity do household items use? http://cfpub.epa.gov/egridweb/view_us.cfm US EPA eGrid database - provides emissions rates for each M Spreadsheet by Karin Kirk, Science Education Resource Center at Carleton College. Feel free to use and modify this spreadshe red to running a laptop. You can change some of the variables to calculate different scenarios. Megawatt CO2 output Kilowatt- watt-hours hours (lb CO2 per CO2 emissions (lb) hours (kWh) (MWh) MWh) 225 0.225 0.000225 1,329 0.3 207.5 0.2075 0.0002075 1,330 0.3 270 0.27 0.00027 1,329 0.4 usehold items use? ovides emissions rates for each MWh of electricity generation, 2005 data, US average to use and modify this spreadsheet for educational use.
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