Save
Physics
SP3
Save
Share
Learn
Content
Leaderboard
Learn
Created by
Emma Harris
Visit profile
Cards (27)
Types of
energy stores
Thermal
Kinetic
Nuclear
GPE
Law of conservation of energy
Energy cannot be created or destroyed
~Energy is measured in
Joules
What is a
closed system
?
A closed system is a system that does not exchange matter or energy with its surroundings.
Four types of
energy
transfers
Mechanically e.g. pushing
Electrically e.g. charges
By heating
By radiation e.g. sun
How to work out
total energy input
?
Useful energy output + wasted energy
Efficiency
useful energy transferred/ total energy input
How
insulation
in your house helps?
-Cavity walls-
create an air gap which reduces amount of energy
-Loft insulation-
good insulator reduces loss by conduction
-Double glazed windows-air gap
Non-renewable resources
Will run out one day
,
finite
Three main
fossil fuels
Coal
Oil
Natural gas
Renewable resources
Will never run out
Examples of
renewable resources
The sun
Wind
Hydro-electricity
Bio-fuel
Tides
Renewable resources- solar cells
Solar cells
-Use energy transferred by light to create electrical currant
-Depends on country also no power at night
Renewable resources- wind power
Wind power
-Has generator inside
-Only work when it is windy
Renewable resources-bio-fuels
Bio-fuels
-Made from plants and waste
-Not enough space for crops to grow that are food
Renewable resources- hydro-electricity
Hydro-electricity
-Involves flooding a valley by building dam
-Impact on environment
Renewable resources- tidal barrages
Tidal barrages
-Big dams with turbines in them
-Affect boat access and alter habitat
Advantages
of non-renewable resources
-Reliable
-Cost effective
Disadvantages
of non-renewable resources
-CO2 emissions
-They will run out
-Environmental issues from extraction
3 ways
heat transfers
Conduction
Convection
Radiation
Conduction
Vibrations passed from particle to particle in a solid
-Best conductor because of strong structures
Best conductors
-Solid
-Liquids
Best insulators
-Vacuum
-Gases
Convection
Movement of particles in a fluid depending on their temperature
Convection current
The way that heat is transferred throughout a fluid
Radiation
Transferring energy by heating
What are
heat rays?
Infra red radiation
Facts about radiation
-Black is the best absorber and emitter
-Lighter surfaces are best at reflecting and worst at emitting