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Energy Conservation and Transfer
Energy Conservation and Transfer
Energy• Energy is the ability to do
work ( it makes things happen) • Work – applying a force to
move an object (transferring energy)
• You have to exert a force AND move something to qualify as doing work.
Types of energy• Kinetic – energy of a moving
object• Potential – energy that is stored in
an object because of its position• demo
Types of energy• Chemical – energy stored in bonds of
molecules ex : coal, food• Solar – energy from the sun• Electrical – when electricity creates
motion, light, or heat ex: battery
• The Law of Conservation of energy: energy can not be created or destroyed, only transferred
• Can lose ability to use energy
Transferring Energy • Energy transfer = energy is moved
from one location to another• During energy transfers, (at
least a little) energy is always lost in the form of heat
• Efficiency varies
Energy as fuel• Fuels - concentrated sources of
energy• Fossil fuels – concentrated
biomass
Types of Solar Energy• Photovoltaic cells– convert suns rays into electricity
How photovoltaic cells can be used
Types of Solar Energy• Solar Batteries – charged using
solar panels• Solar Reflector – curved mirror
that concentrates sunlight and generates electricity
• video
Video Questions• 1. Electricity is produced by
burning ____ to make _____ which powers a ______.
• 2. Fossil fuels cause ______ in cities.
• 3. Black _____ the most solar heat.• 4. What are 3 benefits of using
solar energy?• 5. What are 3 downsides of using
solar energy?
• Renewable resource: produced at the same rate it is used
• Ex - ?• Wind movie
Types of Energy Resources
Types of Energy Resources
• Non renewable energy –regenerated (created) slower than they are used
• Energy career movie
Impacts of Energy Resources
• Pros and Cons about energy resources
• Negative affects Movie
• 1. Why was the dam built?
• 2. List 3 ways the native people of Columbia were affected by it.
• 3. List 5 ways oil can affect plants/animals.
Energy Pros and Cons
Type of energy
Pros (positives)
Cons (negatives)
Nuclear No pollution, no destruction of the earth, inexpensive
Releases radioactive waste, can be deadly
SolarAt least one per box
Wind
Fossil Fuels
Hydroelectricity
Conserving Energy
• The practice of decreasing the amount of energy you use
• Energy movies 1 and 2