energy Flashcards
Name the energy stores
Thermal Kenetic Gravitational potential Elastic potential Chemical Megntic Electrostatic Nuclear
What is a system
Single object or group of objects
What happened to energy in a system change
Energy is transferred
What is a closed system
Matter nor energy can enter or leave
How is energy transferred in a kettle
This is a two object system
Electrically transferred to thermal store of kettle and then transferred by heating to the water thermal store
How doing work transferes energy
By a force moving an object
Gravitational force does work
Energy is transferred from gravitational potential to its kinetic store
What is conservation of energy
Energy can be transferred usefully stored or dissipated but can never be created or destroyed
How lubrication helps reduce wasted energy
Reduces the frictional force meaning less energy wasted to thermal store
Ways to insulate a house
Thick walls Cavity walls Loft insulation Double glazed windows Fraught excluder
How do radiators heat the air
1) energy transferred from radiator to air by conduction
2) air by radiator becomes warmer and less dense
3) warm air replaced by cold
4) warm air cools and repeats
5) convection current
How convection works
Energetic particles move away from hotter to cooler religions
Energy transferred by heating to thermal and energy is shared along particles
Particles move faster making space less dense
Warmer and less dense air rises
How conduction works
Process where vibrating particles transfer energy to neighbouring particles
Heating the energy transferres to thermal store and kenetic store of particles
A measure of how quickly energy is transferred through a material
What are non renewable resources
Run out one day
Coal,oil,gas
What are renewable resources
Never run out
Solar cell
Neg and pos
Generate currents from sunlight
Can’t increase with demand
Free
Small scale
No pollution
Reliable
Cost effective
Geothermal
Pro and beg
Volcanic areas
Free
Little damage
Cost
Not many locations
Hydro
Pro and beg
Flooding valley by building dam
No pullotion
Immediate response
Reliable
Small scale
Loss of habitat
Damage environment
Cost
Wave
Pro and beg
Turbines located along cost
No pullotion
Large scale
No cost
Disturb sea
Habitat destroyed
Spoil view
Unreliable
Wind
Pro and negs
Turbines
Spoil view
Noisy
Impossible to keep with demand
Cost
No pullotion
No fuel cost
No permanent damage
Tidal barrage
Pro and beg
Big dam built across river with turbines
No pullotion
Reliable
Spoil view
Alter habitats
Highly unreliable
High cost
Bio files
Pro and beg
Burnt plant
Carbon neutral
Reliable
Cost
Space
Forest cleared
Carbon dioxide
Problems of non reliable
Carbon dioxide Sulfur dioxide Coal mining Oil spillage Nuclear waste
Three reasons why renewable energy is not used
Reliability
Money
Politics
