Energy

• What are the eight types of energy stores?

  Elastic potential, electrostatic, kinetic, chemical, gravitational potential, thermal, nuclear, magnetic
• What are the five different systems for energy transfers?

  • Mechanical
  • Electrical
  • Heating
  • Radiation
  • Work done
• What is the formula for kinetic energy?

  $E_k =$$\frac{1}{2}mv^2$
• What does the efficiency equation represent?

  Efficiency = Useful output energy / Total input energy
• What is the definition of power?

  Rate of energy transfer or work done
• What is the conservation of energy principle?

  Energy cannot be created or destroyed
• What is specific heat capacity?

  Energy needed to raise 1 kg by 1 °C
• What is conduction?

  Transfer of energy through vibrating particles
• What is convection?

  Movement of energetic particles from hot to cool
• How can unwanted energy transfers be reduced in buildings?

  • Use materials with lower thermal conductivity
  • Increase wall thickness
• What is the effect of lubrication on energy transfers?

  Reduces friction and energy dissipation
• What are non-renewable energy resources?

  Resources that will run out eventually
• What are renewable energy resources?

  Resources that will never run out
• What is the impact of burning fossil fuels?

  Releases CO2 and contributes to global warming
• What is the role of nuclear fuel in energy generation?

  Undergoes fission to generate electricity
• What are the advantages of hydro-electric power?

  Produces no pollution when in use
• What are the disadvantages of wind power?

  Turbines stop when wind is too strong or weak
• What is geothermal energy used for?

  Heating buildings and generating electricity
• What are bio-fuels made from?

  Plant products or animal dung
• What are the reasons for increasing the use of renewables?

  Environmental concerns and resource depletion
• What is the trend in electricity use from 1900 to 2000?

  Electricity use increased with population growth
• What is the trend in electricity use from 2000 onwards?

  Electricity use decreased due to efficiency