# Energy Efficiency

Energy Efficiency

Energy Efficiency

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6.According to energycalculator.com, an average 14-15 inch laptop runs at about 60 W.

a. Assuming that every undergraduate in Harvard College (about 6,700) uses their laptop for six hours per day, how much energy is consumed per day? Report your answer in kWh. [1 pt]

b. How much of each fuel below is needed to supply this amount of energy each day? Assume 100% efficiency. Show your work and report your answers in kilograms in the table below. [2 pts]

c. How much CO2 results from the needed amount of fuel each day? Show your work and report your answer in kilograms in the table below. [2 pts]

5

 Fuel Energy Content Carbon Footprint Daily Harvard College laptop use (kWh/kg) (g CO2 eq/kWh)* Fuel (kg) CO2 Footprint (kg) Coal 8.3 900 Oil 13.0 650 Natural Gas 15.4 420 Uranium (breeder) 2.2*107 5

*http://www.geni.org/globalenergy/library/technical-articles/carbon-capture/parliamentary-office-of-science-and-technology/carbon-footprint-of-electricity-generation/file_9270.pdf

7. What did you find most surprising or interesting from this homework assignment? Why? [3 points]

8.BONUS: Can you identify immigrants who had a major influence on US technology? If you have a candidate or candidates, give a brief summary paragraph on why you think they belong in this technology Hall of Fame. [4 points] We already mentioned:

a. Alexander Graham Bell (1847-1922)

b. Nikola Tesla (1856-1943)

c. Elon Musk (1971- )

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