This document discusses where electricity comes from and how it is generated. It explains that most electricity is currently generated by burning fossil fuels like coal, oil and natural gas in power stations. These fossil fuels were formed over millions of years from the remains of ancient plants and animals. Burning fossil fuels releases carbon dioxide and causes pollution and global warming. The document also introduces renewable sources of electricity like solar, wind and hydropower as more sustainable alternatives.
A short presentation about solar energy, renewable energy, advantages and disadvantages of solar energy, applications of solar energy. Life of earth.
Non-renewable energy and disadvantages of non renewable energy.
A short presentation about solar energy, renewable energy, advantages and disadvantages of solar energy, applications of solar energy. Life of earth.
Non-renewable energy and disadvantages of non renewable energy.
about generating power with good environment measures,as convectional process may damage the atmosphere ,,&more ever using unlimited resources to have generation of acive or usefull power .as the coal is main resource in generating power but it may exist for long time,,,so its our intension to find a resource that exit for long time
sources of energy, in this presentation you will be knowing about two major types of sources of energy those are the geothermal energy and the nuclear energy. in this presentation you will learn what is geothermal and nuclear energy, how they are formed their advantages and disadvantages and final why do we need resources.
about generating power with good environment measures,as convectional process may damage the atmosphere ,,&more ever using unlimited resources to have generation of acive or usefull power .as the coal is main resource in generating power but it may exist for long time,,,so its our intension to find a resource that exit for long time
sources of energy, in this presentation you will be knowing about two major types of sources of energy those are the geothermal energy and the nuclear energy. in this presentation you will learn what is geothermal and nuclear energy, how they are formed their advantages and disadvantages and final why do we need resources.
Environmental Science Table of Contents 47 Lab.docxYASHU40
Environmental Science Table of Contents
47
Lab 4
Energy Sources and Alternative Energy
Energy Sources and Alternative Energy
Concepts to Explore
• Energy
• Non-renewable sources
• Passive solar energy
• Active solar energy
• Photovoltaics
• Wind energy
Introduction
Energy is essential for life to exist in any environment. As humans, we consume huge quantities of energy
every day. This, however, comes with many consequences. Although energy is abundant everywhere, useful
energy is much more difficult to produce and less efficient for our daily activities. Over 90% of produced ener-
gy comes from non-renewable resources. These include oil, natural gas, coal, and uranium. Not only are our
sources of fossil fuels and other nonrenewable energy sources depleting, but many of these sources produce
toxins that are harmful to our bodies and the environment. Fossil fuel depletion, deforestation, pollution, and
global warming are just a few negative effects that come from the combustion of many nonrenewable energy
sources.
Non-renewable Sources
Oil is derived from the remains of plants and animals that lived in aqueous
environments millions of years ago. Over very long periods of time, the
heat from the Earth’s core and the pressure from the sand, silt, and rock
that deposited on top of it turns the remains into crude oil. Scientists and
engineers explore areas to find rocks that indicate the presence of oil un-
derneath, and drill through them to tap into the reservoir holding the yel-
lowish-black substance. After the oil is drilled, it is sent to a refinery to be
separated into usable petroleum products—most of which are used to pro-
duce energy. These include: heating oil, jet fuel, heavy fuel oil, liquefied
petroleum gases, and gasoline.
? Did You Know...
The following products are
made from petroleum?
• Ink
• Deodorant
• Crayons
• Dishwashing liquid
• Eyeglasses
• CDs and DVDs
• Tires
• Ammonia
• Artificial heart valves
Coal is another nonrenewable energy source that is derived from sedimentary rock comprised mainly of car-
bon and hydrocarbons. It takes millions of years to create and forms from dead plants that became trapped
under dirt and water. There are four main types of coal: anthracite, bituminous, subbituminous, and lignite.
Coal is classified into these groups based on the amount of carbon it contains. When coal is buried less than
200 feet underground, surface mining technologies can be used to extract it. However, it if is deeper than 200
feet, underground mining is performed to reach and extract the coal. More than 90% of the coal mined in the
US is used for generating electricity. Even though coal is an inexpensive fuel source, it is important to re-
49
Energy Sources and Alternative Energy
member that mining alters the topography and also can cause secondary pollution to waterways and the air.
Similar to oil and coa ...
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Instructions for Submissions thorugh G- Classroom.pptx
Thinking about electricity
1. Thinking about Electricity
Learning Objectives
•To know that we can make electricity in
different ways.
•To begin to understand how the way we get
electricity can affect our environment
2. Where does our electricity come
from?
• Electricity is made or generated in different ways. Can
you think of some?
• Most of our electricity is made using fossil fuels. What do
you think these are?
gas
oil
coal
3. Why do you think these are called
fossil fuels?
Millions of years ago, before the dinosaurs roamed the earth,
lots of plants grew strong from the energy of the sun. Then they
died and became buried in thick layers beneath lots of mud and
soil. The remains of animals became buried as well. Over the
millions of years, the mud and soil changed to rock and the
layers above the rotting plants and animal remains grew heavier
and heavier and thicker and thicker.
All these organic remains (dead plants and animals) got
squashed and a mixture of pressure and heat turned some
organic material into coal, some into oil and some into natural
gas. People found out that if they dug down deep enough and
got these fossil fuels out, they could burn them to get energy.
Can you act out this story?
4. So how do we get electricity from
fossil fuels?
• Most electricity is produced by burning fossil fuels in
power stations.
• Coal, oil and natural gas are burned in furnaces to heat
up water. The boiling water makes steam which pushes
the gigantic blades of a turbine to produce electricity.
Power stations give off lots of steam
which you can see.
Power stations give off pollution,
which you can’t see.
When we burn fossil fuels we put
lots of carbon dioxide into the air.
This is a cause of Global Warming.
5. It takes millions of years to make
fossil fuels
• What will happen when they run out?
• Because fossil fuels won’t last for ever we call
them non – renewable. This means they can’t
be renewed.
• Look at a piece of coal – think how long it took it
to be formed. What is it like?
6. Some countries use nuclear power
Nuclear
power
plant
Nuclear power plants use a
material called uranium to produce
electricity.
Nuclear power plants make
electricity by splitting tiny atoms of
the uranium to release energy.
Nuclear plants also have waste
materials that are very dangerous
and have to be looked after safely
for thousands of years.
7. How else can we produce
electricity?
PV
panels
Wind
turbines
These are some of the
ways we can get
‘renewable’ energy.
This means that the
source of the energy
will not run out.
Water
wheels
How is the
electricity
being
generated?
8. Now watch the film of Cassop
Primary School and see how they
get their electricity
How does your school get its electricity?
Do you use any renewables?
10. Glossary
•
•
•
•
•
•
•
•
•
•
•
Atom – an incredibly tiny particle of matter
Electricity – the flow of electrical energy
Fuel – something that is burned to give heat
Furnace – a place where a fuel is burned, which gets very hot
Gas – something that is not a liquid nor a solid at ordinary
temperatures (like air)
Generate – to produce electricity
Global warming – an increase in the world’s temperature believed to
be mainly caused by the greenhouse effect
Greenhouse effect – warming of the earth’s surface caused by
pollution from some gases
Pollution – too much of something we don’t want in the wrong place,
causing harm
PV panel – a panel containing photovoltaic cells which convert energy
from the sun into electrical energy
Turbine – a machine with blades that can be turned to generate power
12. Atom
Electricity
Fuel
an incredibly tiny particle of matter
Gas
Furnace
an increase in the world’s temperature believed to
be mainly caused by the greenhouse effect
something that is burned to give heat
the flow of electrical energy
something that is not a liquid nor a solid at ordinary
temperatures (like air)
a place where a fuel is burned, which gets very hot
Generate
to produce electricity
Global warming
Greenhouse effect
Pollution
too much of something we don’t want in the wrong
place, causing harm
a panel containing photovoltaic cells which can
convert energy from the sun into electrical energy
PV panel
a machine with blades that can be turned to generate
power
Turbine
warming of the earth’s surface caused by pollution
from some gases
