8 th Grade Do Now 09/30/13 Essential Question: How is energy essential to our way of life? Objective: –I can define Energy –I can describe various forms.

8th Grade Do Now 09/30/13

• Essential Question: How is energy essential to our way of life?

• Objective:– I can define Energy– I can describe various forms of energy.

• Homework: Bring in Poster Board for Wednesday

• Do Now: Set up do nows for week 9• Explain conduction and give an example of

how it transfers heat energy.• Explain radiation and give an example of how it

transfers heat energy.

Alternative Sources of Energy

Nonrenewable vs. Renewable

Non-renewable

Non – Renewable Energy - are sources that can not be replenished in a short period of time

What is non-renewable energy?

Renewable Energy – is energy that can be replenished naturally

Renewable Energy

What is renewable energy?

Energy Efficiency and Energy Conservation

Energy conservation - is any behavior that results in the use of less energy.

Turning the lights off when you leave the room and recycling aluminum cans are both ways of conserving energy.

What is Energy Conservation?

Energy Efficiency and Energy Conservation

Energy efficiency - is the use of technology that requires less energy to perform the same function.

In regards to the “musical chair” activity, how important is energy efficiency?

What is Energy Efficiency?

Examples of Renewable Sources

• Geothermal- uses the heat that comes from deep rocks under the surface of the Earth.

• Hydroelectric- generated from running water. (United Streaming Video)

What is geothermal energy?

What is hydroelectric energy?

Examples of Renewable Sources

• Solar- The sun releases energy due to the nuclear fusion of hydrogen taking place within its core.

The solar panels convert the sun’s energy into electricity. (United Streaming Video)

What is Energy Efficiency?

Examples of Renewable Sources of Energy

• Wind- used to turn wind turbines and make electricity (United Streaming Video)

• Biomass- uses the energy from plants and waste materials to make electricity. For example, wood can be burnt to make steam that turns turbines to make electricity

What is wind energy?

What is biomass energy?

Examples of Non-renewable energy

• Oil and gas- fossil fuels that were formed millions of years ago. Organisms died and the carbon in their bodies was eventually turned into oil and gas.

• Coal-a fossil fuel that was formed millions of years ago when trees and plants died and formed a layer of peat. These layers continued to develop layers, which turned the peat into coal.

What is oil and gas energy?

What is coal energy?

Pros for Wind Energy

• It is renewable

• Wind is free

• Wind turbines do not produce pollutants or greenhouse gases

• Eventually, it can be cost effective

What are the pros of wind Energy?

Pros of Solar Energy

• It is renewable

• Gives off no pollution

• Can be installed on rooftops

• Eventually, it will be cost-effective to the user

• Allows us to become less dependent on fossil fuels

What are the pros of Solar Energy?

Open Response Question• Complete the open

response question and place it into your class period box.

• Finished? – Begin working on your

alternative energy foldable

Cons for Solar Energy

• The cells are expensive

• Weather can impact the efficiency of solar cells

• Pollution can impact the efficiency of solar cells

What are the cons of Solar Energy?

Cons for Wind Energy

• Turbines can be damaged during storms

• Can be harmful to wildlife

• Noise can be disturbing

• Low wind speed can impact efficiency

What are the cons of wind Energy?

Pros for Hydroelectricity

• No waste or pollution • Can be used throughout the world • Energy is virtually free • More reliable than wind, solar, or

wave power • Water can be stored above the dam

ready to cope with peaks in demand • Hydroelectric power stations can

increase to full power very quickly, unlike other power stations

• The sun provides the water by evaporation from the sea

• Could eliminate the cost of fuel

What are the cons of hydroelectric Energy?

Cons for Hydroelectricity

• Smaller models depend on availability of fast flowing streams or rivers

• Run-of-the-River plants can impact the mobility of fish and other river life

• Dams are very expensive to build • Building a large dam will flood a very

large area upstream, causing problems for animals that used to live there

• Finding a suitable site can be difficult • Water quality and quantity downstream

can be affected, which can have an impact on plant life

What are the cons of hydroelectric Energy?

Pros for Nuclear Energy

• Costs about the same as coal

• Does not produce smoke or carbon dioxide

• Produces huge amounts of energy from small amounts of fuel

• Produces small amounts of waste

• It is reliable.

Cons of Nuclear Power

• Nuclear waste is very dangerous.

• Nuclear power is reliable, but a lot of money has to be spent on safety.

• If things go wrong it can produce a major disaster.

8th Grade Exit Slip

• What are the four types of renewable sources of energy?

8th Grade Do Now 10/13/11

• Essential Question: How is energy essential to our way of life?

• Objective:– I can describe various forms of energy.– I can describe various factors that impact our Earth.

• Homework: Kyoto Protocol complete the lab worksheet

• Do Now: – Take out your Mythbusters Testing the Greenhouse

effect worksheet.– Answer the following questions:

1. What is one pro for biomass energy? 2. What is one con for biomass energy?