P1a key words flashcards
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P1a key words flashcards



AQA P1a key words

AQA P1a key words



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P1a key words flashcards P1a key words flashcards Presentation Transcript

  • Physics P1aKey Words
  • Fossil fuels
  • Fuels that are formed in the Earth overmillions of years from the remains of deadanimals and plants, for example coal, oil and natural gas
  • Conduction
  • The transfer ofthermal energy (heat)from the hotter partsof a substance to the colder parts of thesubstance without the substance itself moving.
  • Convection
  • •The transfer of thermal energy (heat) by the movement of a liquid or gas
  • Radiation
  • The transfer ofthermal energy by infra-red waves
  • Chemical energy
  • The energy stored in fuel (includingfood). This energy is released whenchemical reactions take place.
  • Kinetic energy
  • The energy of a moving object
  • Gravitationalpotential energy
  • The energy of anobject due to its position
  • Elastic energy
  • The energy storedin a springy objectwhen we stretch or squash it
  • Electrical energy
  • The energytransferred by an electric current
  • Thermal energy
  • The energy due tothe temperature of an object
  • Joules (J)
  • The unit of energy
  • Watt (W)
  • The unit used to measure power. 1 watt is 1 joule ofenergy transferred each second
  • Kilowatt (kW)
  • is equal to 1000 watts
  • Kilowatt-hour (kWh)
  • the energy suppliedto a 1kW device in 1 hour
  • Transformer
  • used to increase(step up) or reduce (step down) the voltage
  • Solar cells
  • transfers energy from the Sunsradiation directly into electricity
  • Solar panel
  • these absorb energy from thesuns radiation and transfer it as thermal energy (heat)
  • Geothermal energy
  • thermal energy (heat) from inside the Earth. It is produced from the natural decay ofradioactive material including uranium
  • Non-renewable energy
  • energy that gets used up and willeventually run out
  • Turbine
  • this is made to turn by moving water, steam or wind. It transfers kinetic (moving) energy from themoving substance as its own kinetic
  • Greenhouse effect
  • the Earth being keptwarm by gases such as carbon dioxide in the atmosphere. Burning fossil fuels produces more carbon dioxide and so increases the greenhouse effect
  • Global warming
  • the earthstemperature risingdue to the effect of increased greenhouse gases
  • Efficiency
  • the fraction (orpercentage) of theenergy supplied to a device that is usefully transferred
  • Nuclear fuels
  • radioactivesubstances such as uranium andplutonium that are used for nuclearfission in a nuclear power station
  • Acid rain
  • rain that is more acidic than usual because of dissolved sulphurdioxide or nitrogen oxides
  • Tidal barrage
  • a dam built across a river estuary sothat electricity canbe generated from the tides.
  • Hydro-electricity
  • electricitygenerated using the gravitationalpotential energy of water stored behind a dam
  • End