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
