Questions What is needed to produce electricity from wind energy on a large scale? SA: Ch: 5 Sec: 3 Part 2 “Alternative Resources” EQ: How do humans use.

QuestionsWhat is needed to produce electricity from wind

energy on a large scale?

SA: Ch: 5 Sec: 3 Part 2 “Alternative Resources”EQ: How do humans use Solar Energy?

May 19, 2015

Agenda

1.Roll

2.Chapter 5 Section 3 Part 2

“Alternative Resources”

1.Video: “Electricity and Magnetism”

Come in Quietly and sit at your desk, open to your notes, write the new question, and wait quietly for class to begin.

Sitting in the SunWhen sunlight falls on your skin, the warmth

you feel is part of solar energy.

Solar EnergySolar energy is energy from the sun.

Every day, the Earth receives more than enough solar energy to meet all of our energy needs.

Solar Energy

Solar energy is considered to be a renewable resource.

Solar Energy

Solar energy can be changed directly into electricity.

Solar Energy

Solar CalculatorSolar calculators receive all the energy they

need from their solar cells.

Solar CellA single solar cell produces a small amount

of energy.

Solar CellsThis is good for small devices yet, many are

needed to supply energy for larger devices and homes.

Solar CellsSolar cells are quiet, reliable and have no

moving parts, can last for years with little maintenance, and produce no pollution.

Solar PanelsSolar panels are very expensive. In the long

run they do pay for themselves.

Have you seen solar panels?What other ways have solar panels been

used?

Solar HeatersSolar energy can be used for direct heating

through solar collectors.

Solar CollectorsSolar collectors are dark-colored boxes with

glass or plastic tops. The sun makes the boxes very hot. Water can run through these boxes and be heated.

Solar CollectorsSolar collectors are very expensive, yet in

the long run they will eventually pay for themselves. They can also be used to generate electricity.

Large Scale Solar PowerLarge scale solar power uses mirrors to

focus the sunlight and heat pipes filled with synthetic oil.

Large Scale Solar PowerThis oil will be circulated to heat water that

will cause steam. The steam will then be used to drive an electric generator.

Large Scale Solar Power

Another design uses mirrors to focus the sunlight on a central tower.

Large Scale Solar PowerThe energy is then stored in salt. The salt is

then used to create steam that will drive an electric generator.

Capture the WindWind is created indirectly by solar energy

through the uneven heating of the air.

Wind EnergyThere is a

tremendous amount of energy in the wind, called wind energy.

You can see the effects of this energy in hurricanes and tornados.

Wind EnergyWind energy can be used positively by

humans.

WindmillsWindmills have been used to pump water

from the ground and generate electricity since the 1920’s.

Wind TurbinesThe modern windmill is called a wind

turbine. Clusters of these wind turbines are often called wind farms.

Benefits to Using Wind TurbinesWind turbines take

up only a small portion of ground surface. This allows the land to be used for more than one purpose.

Wind energy is renewable. Wind farms can be built in 3 – 6 months. Wind turbines produce no air pollution.

Benefits to Using Wind Energy

Disadvantages to Using Wind Energy

Wind only blows strongly and steady only in some places in order to produce electricity on a large scale.

“Electricity and Magnetism”

1. What did you know?_______________________________________________________________________________________________________________________________________2. What did you learn?_______________________________________________________________________________________________________________________________________3. What do you want to know?_______________________________________________________________________________________________________________________________________

Review1. What are two ways of using solar

energy?

Response: Two ways of using solar energy is …

2. What is needed to produce electricity from wind energy on a large scale?

Response: In order to produce electricity from wind energy you need …

3. What are solar collectors used for?

Response: Solar collectors are used for …