renewable energy .pptx

7/27/2019 RENEWABLE ENERGY .pptx

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RENEWABLE ENERGY


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What isrenewable

energy?

Types ofenergy

Introduction ofenergy

BenefitExample


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WHAT IS RENEWABLE ENERGY??

Energy exists freely in nature.

Renewable energy resources are always available to be tapped, and will notrun out.

It also called as GREEN ENERGY


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WHEN CAN ENERGY BE CALLED RENEWABLE?

1. When it source cannot run out or can easily be replace

2. When their sources are carbon neutral (not produce carbon)

3. When they DO NOT pollute the environment


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TYPES OF RENEWABLE ENERGY


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HYDRO(WATER)ENERGY

WINDENERGY

Solarenergy


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SOLAR ENERGY

Energy from the SUN

It is called renewable energy becauseI. Technology use to convert suns power electricity does not produce smoke

II. Tapping the sun energy does not usually destroyed the environment.


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BENEFITS SOLAR ENERGY

Its FREE!!!

Possible to generate electricity

Require little maintenance

Silent producer of energy (no noise made from photovoltaic)

Does not cause pollution


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DISADVANTAGES

Large areaof land arerequired to

captured thesun energy

Solar power

station,collector,panels

and cells areexpensive tomanufactur

e

Can only beharnessedwhen it isday time

and sunny


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HYDRO(WATER) ENERGY

HYDRO(WATER)


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HYDRO(WATER)

ENERGYMoving water has kinetic energy

This can be transferred into useful energy in

different ways.

Hydroelectric power (HEP) schemes store water

high up in dams.

The water has gravitational potential energy which

is released when it falls.


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As the water rushes down through pipes, this stored energy is

transferred to kinetic energy, which turns electricity generators.


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The Dam is built to retain the water. More electricity is produced if

the water is more in the reservoir

Sluice Gates: These can open and close to regulate the amount

of water that is released into the pipes.

Potential energy kinetic energy by water flowing

through the pipes with high speed.

The force and high pressure in the water turns a series ofshafts in a generator. Spinning shafts in the generator charges

millions of coils and magnets to create electricity, which is

regulated by a transformer. This is then transported via cables

to homes and factories.

To build a dam there has to be valleys and rivers that flow all

year round. This will help with the building and success of the

dam. This way, the fullest effect of the waters kinetic energy

can be tapped.


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ADVANTAGESElectricity can be produces at constant rate

If electricity is not needed the Sluice Gate can be shut,

stopping electricity generation

The water can be saved for used another time whenelectricity demand is high

The dam can help to produce electricity for many years

The lake form behind the dam can be used for water

sport and leisure activitiesElectricity produce by dam do not produce green

house gasses

DO NOT POLLUTE THE ENVIRONMENT


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DISADVANTAGES

Extremely expansive

Need high maintenance to prevent the dam

break can cause flooding that lead to fatal

Can caused serious geological damage


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WIND ENERGY


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WHAT IS WIND POWER?-Wind is caused by huge convection currents in the Earth's

atmosphere, driven by heat energy from the Sun.

-This means as long as the sun shines, there will be wind.


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The earth's surface has both land and water. When the

sun comes up, the air over the land heats up quicker than

that over water. The heated air is lighter and it rises. Thecooler air is denser and it falls and replaced the air over

the land. In the night the reverse happens. Air over the

water is warmer and rises, and is replaced by cooler air

from land

http://www.eschooltoday.com/energy/renewable-energy/wind-energy.html
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The moving air (wind) has huge amounts

of kinetic energy electrical energy

using wind turbines.

The wind turns the blades, which spin a

shaft, which connects to a generator and

makes electricity.

The electricity is sent through transmissionand distribution lines to a substation, then

on to homes, business and schools.


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-The largest wind turbinein the world, located inHawaii, stands 20stories tall and hasblades the length of afootball field.

-An average wind speedof 14 miles per hour isneeded to convert windenergy into electricity.

-Wind energy is thefastest growingsegment of allrenewable energysources


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ADVANTAGES The wind is FREE!!!

Does not cause pollution

Take up only a small plot of land

One wind turb ine can produc e enough electr ic i ty to

power up to 300 homes.


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DISADVANTAGES

Strength of the wind is not constant

Wind turbine are noisy

The structure are not interesting

Large wind farm are needed to provide

entire communities with enough

electricity


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Q & A

1. What is the renewable energy?

2. List all the sources that can contribute to renewable energy?

3. Where is the largest wind turbine located?


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THANK YOU

renewable energy .pptx

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