Learning Objective: I can learn about different energy sources and their environmental impacts.
Think Out Loud:
Name the ways we use energy every day...
Notes: (Full notes available for your reference on this PowerPoint, start at slide 27)
-Energy is the capacity to do work
-Thermodynamics is the study of the flow or exchange of energy
-1st Law of Thermodynamics: Law of Conservation of Matter – Energy is neither created nor destroyed, it simply changes form (the net energy in the entire universe is constant)
-Photosynthesis is the transformation of radiant energy to chemical energy
-Energy efficiency refers to the measure of useful energy
-An energy efficient appliance would convert the energy supplied to it with a minimal amount of heat returned as energy
-% efficiency = (output/input) x 100
output is mechanical work or energy (watts or joules)
input is the quantity of work or energy
-Energy is expressed as kilowatt-hours (kWh): a unit of energy equal to the work done by a power of 1000 watts operating for one hour
-Power is the rate of consumption of that energy and is expressed in watts or power = energy/time
-A watt is expressed in SI terms as 1 Joule per second
-Where does your electricity come from? (video, 1 min)
-1/3 of the energy consumed globally is used to produce electricity
-Annual global consumption is 16 trillion kWh
-The US consumes 4 trillion kWh annually; it has 4.5% of the population and uses 25% of the electricity
What is the per capita energy usage if current population is 7 billion?
-76% of the commercial energy we use comes from nonrenewable fossil fuels (oil, natural gas, and coal)
-Renewable energy = supplies of energy will not be depleted by our use (sunlight, geothermal energy, wind energy)
-Nonrenewable energy = supplies are being depleted and would take millions of years to replenish (oil, coal, natural gas, nuclear energy)
-Fossil fuels are non-renewable
-There are three fossil fuels: coal, oil and natural gas.
-Coal is the predominant fossil fuel used to generate electricity (52%)
-Fossil fuels we burn today are formed from organisms from 100 - 500 million years ago
-Fossil fuels are our dominant source of energy
-High-energy content of fossil fuels makes them efficient to burn, ship, and store
HOMEWORK:
-Use Quizlet to learn Energy Unit vocabulary terms
-Write down terms and definitions in notebook, will be checked next class
Go to the class blog on your phone and click here: Quizlet - energy vocabulary terms (22 words)
(Or you can go to Quizlet.com or the Quizlet app and search 'erinlmferro' for the word set called 'energy vocabulary terms')
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