Energy

• What are the 9 forms of energy?

  Sound, Heat, Atomic, Kinetic, Electric, Light, Chemical, Elastic, Gravitational
• What does the law of conservation state?


  energy cannot be created or destroyed, only converted from one form to another
• When is the only time energy is useful?

  when its converted from one form to another
• In what form is energy nearly always lost or destroyed as?

  heat
• How do you find the total energy input?

  useful energy + wasted energy
• what is the formula for energy efficience?

  useful output/energy input x 100
• What form of energy to we get from food?

  Chemical
• What form of energy do we transfer chemical energy from food into?

  Kinetic
• What is our main form of wasted energy?

  heat
• if the energy input of a machine is 1000j and the useful output is 750j calculate the % efficiency

  75%
• How is coal formed?

  Decomposition of plant matter over millions of years.
• how is oil and natural gas formed


  Tiny marine animals buried for millions of years and the enormous heat and pressure turned it into oil and natural gas.
• How do fossil fuels create electricity?

  Contains chemical energy which changes to heat energy when they are burnt
• Why do we need alternatives to fossil fuels?

  Fossil fuels contribute to Climate change and it is non-renewable so we are running out.
• Two solutions to the effects of fossil fuels?

  Increase insulation in homes, reduce energy consumption, educate public
• Name the 7 forms of alternative renewable solutions to fossil fuels

  Tidal, solar, geothermal, wind, hydroelectric, wave, biomass
• How does solar power produce electricity?

  Energy carried in sun waves in converted to electricity using Photovoltaic cells
• What is an advantage of biomass energy?

  Renewable, carbon neutral
• Disadvantage of wind power?

  Unreliable-depends on wind
• What are the three main components of a coal burning power station?


  Boiler, turbine, generator