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
