Jan MarešDuy Le Duc

WHAT IS ENERGY WHAT IS ENERGY ??

ENERGY IS DEFINED AS „THE ABILLITY TO DO WORK“

ONE OF THE MOST FUNDAMENTAL PARTS OF OUR UNIVERSE

EVERYTHING WE DO IS CONNECTED TO ENERGY IN ONE FORMTO ANOTHER

ALTERNATIVE SOURCES OF ENERGY ALTERNATIVE SOURCES OF ENERGY

NOT BASED ON THE BURNING OF FOSSILS FUELS OR SPLITTINGOF ATOMS

SOLAR, WIND, HYDRO, GEOTHERMAL, BIOMASS,…

WHERE IS ENERGY WHERE IS ENERGY USED ?USED ?„ENERGY IS AN IMPORTANT PART OF OUR DAILY

LIVES“ WORK

LIGHHTS OUR CITIES

POWERS OUR VEHICLES, TRAINS AND PLAINS

WARMS OUR HOMES

COOKS OUR FOOD

PLAYS OUR MUSIC, GIVES US PICTURES ON TV

„LIFE WITHOUT ENERGY IS NOT POSSIBLE “

TYPES OF ENERGY SOURCESTYPES OF ENERGY SOURCES

F O S S I L F U E L S

R E N E W A B L E S O U R C E S

N U C L E A R P O W E R

W I N D E N E R G YW I N D E N E R G Y

H o w d o e s i t w o r k ?Wind turbines convert the kinetic energy of the wind into other forms of energy,either mechanical or electrical energy.U t i l i z a t i o n:pumping water, grinding grain, generate electricity and charging batteries

A d v e n t a g e s:

D i s a d v e n t a g e s:

Inexhaustible source NO pollution

Low energy production Not many windy areas in the World Relatively expensive

W h e r e i t c a n b e u s e d m o s t ?In California, Danmark, Germany and HollandV o c a b u l a r

y:grinding grain = mletí obilí

inexhaustible = nevyčerpatelný

P i c t u r e s:

S O L A R E N E R G YS O L A R E N E R G Y

B a s i c i n f o r m a t i o n

Solar Water Heating Collectors

The sun is very powerful sources of energy.Solar energy can be aplied in many ways. There are 3 main types:

SOLAR WATER HEATING COLLECTORS

PHOTOVOLTAIC or SOLAR ELECTRIC PANELS (cells) SOLAR FURNACES

These panels absorb the energy from the sun and transfer it to heat water

PHOTOVOLTAIC or SOLAR ELECTRIC PANELS

These panels transform the solar radiation directly into electricity.

SOLAR FURNACES

Use a huge array of mirrors to concentrate the Sun's energy into a small space and produce very high temperatures (up to 33,000°C).

This high temperature can be use to heat to make steam and drive a generator (turbines) to make electricity.

At Odellio (France), there is one big mirror that is used for scientific experiments.

P i c t u r e s:

A d v e n t a g e s:

D i s a d v e n t a g e s:

needs NO fuel

products NO waste or pollution

doesn´t work at night

very expensive to build solar power station

H Y D R O E N E R G YH Y D R O E N E R G Y

H o w d o e s i t w o r k ?A dam is built to trap water, usually in a valley where there is an existing lake. Water is allowed to flow through tunnels in the dam, to turn turbines and thus drive generators.

We have used running water as an energy source for thousands of years, mainly to grind corn. And now, we´re using it to make the electricity.

D i s a d v e n t a g e s:The dams are very expensive to build. It can affect to the water quality and quantity downstream or to the plant and animals life.

A d v e n t a g e s:Once the dam is built, the energy is virtually free. No waste or pollution produced. Hydro-electric power stations can increase to full power very quickly, unlike other power stations. Electricity can be generated constantly.

Do you know? -The first use of water to generate electricity was in 1882 on the Fox river, in the USA. -20% of the world's electricity. -The name comes from "hydro", the Greek word for water.

The centre of the Earth is around 6000 degress Celsius - hot enough to melt rock. Even a few kilometres down, the temperature can be over 250 degrees Celsius.

In general, the temperature rises one degree Celsius for every 36 metres you go down.

G E O T H E R M A L E N E R G YG E O T H E R M A L E N E R G Y

H o w d o e s i t w o r k ?Hot rocks underground heat water to produce steam. We drill holes down to the hot region, steam comes up, is purified and used to drive turbines, which drive electric generators. There may be natural "groundwater" in the hot rocks anyway, or we may need to drill more holes and pump water down to them.

Do you know?

The first geothermal power station was built at Landrello, in Italy. Geothermal power is being used also in New Zealand Iceland, Japan, the Philippines and the United States. The name "geothermal" comes from two Greek words: "geo" means "Earth" and "thermal" means "heat". V o c a b u l a r y:steam: vodní pára

purify: čistit

B I O M A S S E N E R G YB I O M A S S E N E R G YWood was once our main fuel and we use it until now. Sugar cane is grown in some areas, and can be fermented to make alcohol, which can be burned to generate power in the same way as coal. Alternatively, the cane can be crushed and the pulp (called "bagasse") can be burned, to make steam to drive turbines. And also we can use solid, plant, animal wastes, wastesrubbish, animal manure, woodchips, seaweed, corn stalks and other wastes.

Burn Fuel

H o w d o e s i t w o r k ?Heat water to make steam

Steam turns turbines

Turbines turn generators

Electrical power sent aroud country

D i s a d v e n t a g e s:Collecting the waste in sufficient quantities can be difficult. We burn the fuel, so it makes greenhouse gases. Some waste materials are not available all year round.

A d v e n t a g e s:It makes sense to use waste materials where we can. The fuel tends to be cheap.Less demand on the Earth's resources.

V o c a b u l a r y:cane: rákos ferment: kvasit

crush: rozdrtit pulp: loupat

T H A N K T H A N K Y O U Y O U for for

Y O U R Y O U R

A T T E N T I O A T T E N T I O N N