unit 5 energy deborah and ana s
TRANSCRIPT
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By Ana and Deborah
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WHAT´S ENERGY? Energy is the ability of an object to
change things around it. Energy can be mechanical , light , sound
, thermal electrical , chemical or nuclear
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SOURCES OF ENERGY Can be:
Renewable such as water, wind, sun, biomass or waves and tidies
Non Renewable such as fuels or uranium and plutonium
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ENERGY TRANSFORMS Our bodies transform chemical energy
from food into mechanical energy for movement.
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ELECTRICITY Electricity is a form of energy :• We can transport it easy through power
lines.• It can transform into others types of
energy, like the light energy of a light bulb.
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ELECTRICAL CHARGES Static electricity : it occurs when an
object accumulate electrical charge. It can be :
Neutral Positively charge Negatively charge
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CONDUCTING & INSULATING MATERIALS• Conducting materials : electrical charges
moves easily through them.• Insulating materials : electrical charges
cannot move through them.
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ELECTRICAL CURRENT Electrical current is the movement of
electrical charges through a conducting material.
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PRODUCING ELECTRICITY
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HYDROELECTRIC POWER STATION
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NUCLEAR POWER STATION
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THERMAL POWER STATIONS
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WIND FARMS & SOLAR POWER STATIONS
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ENERGY AND THE ENVIRONMENT Producing and using electricity cause
problems to the environment.
Changes in landscapes Depletion Pollution
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USING ENERGY EFFICIENTLY Use public
transport
Turn off heaters Practise the 3 R`s
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WHAT`S MAGNETISM ? Magnetism is the ability of materials to
atract metals.
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CHARACTERISTICS OF MAGNETS
All magnets have two parts, their north poles (N) and their south poles (S)
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THE MAGNETIC POLES OF THE EARTH
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ELECTROMAGNETISM
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