energy Flashcards
name the 8 energy stores?
thermal
gravitational potential
elastic potential
kinetic
chemical
magnetic
electrostatic
nuclear
what is a system?
A system is a fancy word for a single object or group of objects you’re interested in
What happens when a system changes?
the energy has been transferrred
what is a closed system?
It is a system where neither matter or energy can enter or leave
What is an isolated system?
It is a closed system with no external forces acting on them
what is an open system?
It is a system where both matter and energy can enter or leave
what is conduction?
vibrating particles transfer energy to neighboring particles
what is convection?
energy particles move away from hotter to cooler regions
what is efficiency?
the less energy that is wasted in this energy store, the more efficient the device/object is said to be
what is non renewable energy?
this is fossil fuels and nuclear fuel. The three main ones are coal, oil and natural gas. They’re typically burnt and will run out but they provide most of our energy
what is renewable energy?
the key ones are the sun, wind, water waves, hydro electricity, bio fuels, tides and geothermal. These will never run out or damage the environment but they do not provide enough energy and can be unreliable
what is the conservation of energy principle?
Energy can be transferred usefully, stored or dissipated, but can never be created or destroyed.
what is power?
power is the rate of energy transfer or the rate of doing work
why do radiators create convection currents?
heating a room with a radiator relies on creating convection currents in the air of the room.
