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Energy(2) (Convection (conduction, changes density of the particles…
Energy(2)
Convection
changes density of the particles causing them to rise
CAN only happen in liquids and gases
convection currents can be created
radiator is an example of a convection current
Conduction
thermal conductivity is a measure of how quickly energy is transferred through a material
vibrating particles transfer energy to neighbouring particles
liquids and gas usually don't transfer by conduction
MAINLY solids
Reducing dissipating energy
simples things like stream lining a plane prevents friction
insulation reduces the thermal energy transfer
thicker walls
thermal insulation
double gazed windows
all methods to slow down the cooling process
lubrication lubrication prevents maximum friction
see practical on effectiveness of materials insulation
Energy resources and their uses
renewable energy resource will NEVER run out
non-renewable energy resources will run out one day
Uses
transport
heating
electricity
Efficiency
all energy ends up transferred to thermal energy stores
Efficiency = useful output transfer/total input energy transfer
the less energy wasted the more efficient a device is
