Energy Flashcards
what are the 8 energy stores
chemical
kinetic
gravitational potential
elastic
thermal
magnetic
electrostatic
nuclear
what is a closed system
where energy cannot flow in or out of the system
what are 4 ways energy can be transferred
mechanically
electrically
thermally
radiation
what is potential energy
energy that is stored in an object and has the potential to be released
what 3 things affect the transfer of heat from the inside of the house to the outside
- temperature difference
- the thickness of the wall
- the material that the walls are made of
what is energy efficiency
the percentage of energy that is useful
what size wall is better to keep a house warm
thick wall
what type of material should a wall be made out of to keep a house warm and why
material with a low thermal conductivity as it will be a worse conductor of heat which lowers the rate at which energy is transferred to outside of the house
what are the 5 renewable energy sources
biofuels
hydroelectric
wind turbines
tidal power
solar cells
what are bio-fuels
animal or plant matter that is used to produce thermal energy
how does hydro-electricity work
generates electricity from water flowing through a dam and turning a turbine
how does tidal power work
uses the rise and fall of tidal power to turn turbines
how do solar cells work
converts solar energy from the sun directly to electricity
what are the 2 non-renewable sources of energy
fossil fuels
nuclear fuels
what is renewable energy
energy recources that will not run out
