Recap from last time Environmental impacts hard to nail down Energy & electricity a big deal!
US Energy Production & Consumption
Energy Security?
US Energy Production & Consumption 100 Quadrillion BTU
How many Big Macs is that? 576 kilocalories (w/o cheese) 43 trillion That’s a lot
Day Two: Energy & the Environment
Fuzzy Schedule for Today Energy Overview Now with 100% more Schoolhouse Rock! Bedroom Exercise (~9:15) Exciting, but not nearly as exciting as it sounds Energy and electricity (~10:15) Energy and transportation (~11) Lunch (~11:15) Field trip (~noon) Field trip debriefing (~12:45) Alternative fuels (~1:15) Wrap-up (~2:00)
Why is energy important? Imagine life without it Impacts the economy, our society and the environment Lots of green design and environmental engineers study it
How do we measure it? Fundamental energy unit: joule Also BTU, Calorie 1 J = BTU = Calories Used over time (power): joule per second, or watt Also horsepower 1 J/s = 1 W =.0013 HP Use a watt for 3600 seconds: watt-hour Electricity measured (and billed): kilowatt-hour (kWh) 1000 watt-hours Light bulb uses 60 watts: what would meter read after one day? 1.44 kWh (60 watt x 24 hours / 1000)
Where do we get it? Fossil fuels Coal, natural gas, petroleum Petroleum Heating oil, gasoline, diesel, propane Renewable Sources Hydro, wind, solar, geothermal Nuclear Biomass (wood, dried plants)
Where do we use it? Today we’ll look at both electricity and transportation