Recap from last time Environmental impacts hard to nail down Energy & electricity a big deal!
Energy Production & Consumption in the United States
Energy Security?
US Energy Production & Consumption 100 Quadrillion BTU
How many Big Macs is that? 6 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 (~10:00) Where does electricity come from? ** Field Trip (~11:15) Energy and Transportation Lunch (~12:30) Field trip debriefing Alternative Fuels * Wrap-up (~2:00)
Energy Overview 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 Used over time: joule per second, or watt Also horsepower 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 Wood
Where do we use it? Today we’ll look at both transportation and electricity…