Energy:)
Energy Transformation
energy can be converted from one form to another
work is done when energy changes from one form into another
electrical energy > Heat energy and sound energy
chemical potential energy > light energy and heat energy
gravitational potential energy > kinetic energy
light energy > chemical potential energy
elastic potential energy > kinetic energy
Law of conservation of energy
is not saving energy
energy i neither created nor destroyed
change it from one form to another
gravitational potential energy = P.E.=mgh
m=mass
g=acceleration due to gravity
h=height
kinetic energy = K.E.=1/2 mv (squared)
m=mass
v=velocity(speed)
done by : Amantha(2) & joey (17)
Si unit is Joules;J
Source of energy
classified into two groups- renewable and nonrenewable energy
renewable energy
energy is generated from natural resoures
biomass
solar
geothermal
wind
hydropower
wave
tides
Nonrenewable energy
energy that come from a limited source that cannot be replenished and eventually will be depleted
Potential Energy
stored energy due to a body's condition or position
chemical energy
energy stored in the bonds of atoms and moleules
gravitational energy
energy of position or place
Nuclear Energy
stored in the nucleus of an atom-energy that holds the nucleus together
kinetic energy
sound energy
movement of energy through substances in longitudinal waves
electrical energy
movement of electrical charges
Heat energy
the internal energy in substances
light energy
energy that enable us to see
radiant energy
eletromagnetic energy that travels in transvere waves
motion energy
movements of objects and substances from one place to another
energy that a body has due to its motion
Energy is the capacity to do work
Main source of energy
solar energy
energy directly from the sun
can be converted into other form of energy (e.gheat and electrical energy)
solar furnaces
mirrors in solar furnaces heat water to generate steam
the steam is then used to turn turbines to generate electricity
trapped directly by solar panel and mirrors
Biomass
refers to the living and recently dead biological material that can be used as fuels or for industrial production
biomass contains stored energy from the sun after photosynthesis
can be converted into other forms of energy
can be obtained through :
combustion
decay of organic matter
fermentation
fossil fuels
main fossil fuels:
coal
natural gas
oil
contains chemical potential energy,when burnt it converts to other formof energy(e.g. light and heat energy)
causes global warming