Energy)

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Energy:)

Energy makes changes;it does things for us.

Main source of energy

fossil fuels

causes global warming

contains chemical potential energy,when burnt it converts to other formof energy(e.g. light and heat energy)

main fossil fuels:

oil

natural gas

coal

Biomass

can be obtained through :

fermentation

decay of organic matter

combustion

can be converted into other forms of energy

biomass contains stored energy from the sun after photosynthesis

refers to the living and recently dead biological material that can be used as fuels or for industrial production

solar energy

trapped directly by solar panel and mirrors

can be converted into other form of energy (e.gheat and electrical energy)

solar furnaces

the steam is then used to turn turbines to generate electricity

mirrors in solar furnaces heat water to generate steam

energy directly from the sun

Energy is the capacity to do work

kinetic energy

energy that a body has due to its motion

motion energy

movements of objects and substances from one place to another

radiant energy

eletromagnetic energy that travels in transvere waves

light energy

energy that enable us to see

Heat energy

the internal energy in substances

electrical energy

movement of electrical charges

sound energy

movement of energy through substances in longitudinal waves

Potential Energy

Nuclear Energy

stored in the nucleus of an atom-energy that holds the nucleus together

gravitational energy

energy of position or place

chemical energy

energy stored in the bonds of atoms and moleules

stored energy due to a body's condition or position

Source of energy

Nonrenewable energy

energy that come from a limited source that cannot be replenished and eventually will be depleted

renewable energy

energy is generated from natural resoures

tides

wave

hydropower

wind

geothermal

solar

biomass

classified into two groups- renewable and nonrenewable energy

Si unit is Joules;J

done by : Amantha(2) & joey (17)

Law of conservation of energy

kinetic energy = K.E.=1/2 mv (squared)

v=velocity(speed)

gravitational potential energy = P.E.=mgh

h=height

g=acceleration due to gravity

m=mass

change it from one form to another

energy i neither created nor destroyed

is not saving energy

Energy Transformation

elastic potential energy > kinetic energy

light energy > chemical potential energy

gravitational potential energy > kinetic energy

chemical potential energy > light energy and heat energy

electrical energy > Heat energy and sound energy

work is done when energy changes from one form into another

energy can be converted from one form to another