Science Revision Flashcards
What is the law of conservation of energy
Energy can not be created or destroyed, only transferred through light, sound or electricty
What do Thermometres measure
Temperature in degrees Celsius
What does Thermal Energy measure
The total energy
What happens when we heat things up
The particles gain more kinetic energy and vibrate more/faster
What is Equilibrium
Equilibrium is when objects have the same thermal energy
Give examples of renewable resources
Wind, Tidal, Hydroeletric, geothermal, biomass and solar powers (they do not run out)
What are non-renewable resources
Fossil fuels, coal, oils and gas. They are non-renewable because you can not re-use them, and they will eventually run out
How are fossil fuels used
They are burned to heat water which produces steam. The steam turns the turbine which spins a generator. The current is sent out to offices, factories and homes down long cables. The fossil fuels produce greenhouse gases such as carbon dioxide.
How is thermal energy transferred
By conduction, convection, or radiation
What is conduction
When you heat up a solid, the particals colide into others when they vibrate and then the heat spreads (metal is a good conductor)
What is convection
When you heat up a liquid or gas, the particles closer to the heat, move faster and become further apart. The hot part then rises and cools down. The denser part fall and take its place at the bottom. This cycle is called convection current
Food and fuels/ what is energy measured in
In joules ( J )
What is power
How much energy is transferred each second
How are energy bills measured
In 1 Kilowatt per hour (kWh)
