8.P.2.1 and 2.2 Using and Conserving Energy Resources

Warm up Which of these has mechanical energy? A. a burning candle B. a melting ice cube C. a battery D. a moving car

Using Energy Resources In the last 50 years use of fossil fuels have doubled For much of human history wood was used to clean and warm homes and people traveled by foot, animals or boats pushed by wind

Question How do you think the population affects energy consumption ?

Industrial Revolution Industrial Revolution – 1700’s and 1800’s many large factories were built and were powered by steam engines fueled by coal In 1950 the main source of energy in the was US was coal Today we use more oil and natural gas

Conserving energy Conservation – is the careful use and management of resources

How to conserve energy Insulated walls and roofs to reduce heat loss Keep thermostat at a low temp during the winter and use air conditioner less during the summer Turn off lights Buy fuel efficient cars Recycle and reuse Takes less energy to recycle material than to make new material

CFL light bulbs Use 75% less energy to get the same amount of light Save $30 per light bulb over the life of the bulb

NC Energy use by source Renewable resources 5% Coal 31% Petroleum 39% Nuclear Power 16% Natural gas 9%