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By : Puan Siti Hajar

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Meaning : Sources of energy that cannot be 

DEPLETED. Example: water, sun, wind, etc

Renewable energy sources are always 

available.However, it can only be used certain places 

and time..

Can u think about the example source that

only can be used in certain places? Certaintimes?

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????% of earth surface is covered with water.

Uses: Generate hydroelectric

Rain RiverDam(stretch river) potential

energy -kinetic energy (turbine turning) turn the generator generate electric

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Solar energy obtained directly from The Sun

Solar cell absorb light energy electric energy

Uses of solar energy:

a) Heating water in homes

b) Producing electric energy

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Meaning : energy obtained from plants and

organic waste of animals.

In Brazil, sugar cane juice fermented to

obtain alcohol In Japan and Europe, garbage is burnt to

produce heat energy electrical energy

Biomass also can be used to produce 

methane and alcohol.

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Wind is energya lot of kinetic moving air

Strong winds have a kinetic energy

Uses:

1. Pumping water from ponds

2. Moving sailing ships at sea

3. Turning wind turbines to generate electric

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Waves are produces by wind blowing on the 

surface of sea water

Waves have potential and kinetic energy

Use special float design hit by wave. This float moves up and do produce electric

energy

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Geo ´earthµ« thermal ´ heatµrs

The inside layer of earth extremely hot!!

Some of this HOT energy escape through

volcanoes, geyser and hot springs.

In New Zealand, they are using Geysers to

generate electric.

Uses :

1. heat homes

2. Heat factories

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This sources are limited

It CANNOT beDEPLETED

Example: Fossil fuels andRadioactive substances

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Are Natural gas, petrolium and coal

Fossils are animal or planet that have 

decomposed million years ago. High pressure 

and heat inside the earth change this fossils into fuels.

Components of petroleum are petroleum gas,

petrol, diesel, kerosine, etc..

Natural gas is a mixture of methane, butane,ethane, and propane gases

Coal- comes from the remains of dead trees 

inside earth in swampy area.

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Uranium and plutonium ² produce nuclear

energy

Nuclear energy used to :

1. Generate electric energy

2. Supply energy to submarines and ships

3. Producing atomic and hydrogen bombs

4. Supplying energy for satellitess, lighthouse

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This demonstrates a nuclear

chain reaction of atomicbombs.

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This demonstrates a controlled nuclear reactor in a powerplant. The reactor heats up

the heavy water and then that heat is exchanged into a water boiler that produces 

steam which drives a (3) turbine which spins (4) a really strong bar magnet which runs 

(5a,b) a 60Hz, 3-phase generator which goes through (6) a transformer where the two

live wires are reduced down to 120V and sent down the distribution grids.

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