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