Energy Stores

• When energy is transferred to an object, thenergy is stored in an energy store.
• Examples of Energy Stores:

  
  

  • Thermal
  • Kinetic
  • Gravitational
  • Elastic
  • Chemical
  • Magnetic
  • Electrostatic
  • Nuclear

  
• Closed systems are where matter and energy cannot enter or leave.
• Work Done is the same as energy transferred
• Kinetic Energy(J) = 0.5 x mass(kg) x speed^2
• Gravitational Potential Energy(J) = Mass x Gravitational Field Strength(gfs) x height(m)
• Elastic Potential Energy(J) = 0.5 x Spring constant x Extenstion^2
• Change in thermal energy(J) = Mass x Specific heat capacity x Temp change.
• Efficiency = Useful output/ Total input x 100
• No device is 100% efficient.
• Electric heaters are the only 100% efficient devices.
• Wind Turbines are eyesore.
• Wind turbines can be noisy people living near.
• Solar Cells - generate electricity from sunlight. Very reliable in sunny seasons.
• Geothermal Power Is a type of renewable energy that uses the heat generated from the Earth's core to produce electricity.
• Biofuels are fuels made from plants or animal waste. These are burnt to produce electricity.
• Hydroelectric power is a type of renewable energy that uses the movement of water to generate electricity.
• Hydroelectric power can cause loss of habitat as land to be flooded for electricity to be generated.
• Sulfur dioxide causes acid rain.
• Acid rain is toxic and harmful to trees and plants.
• Power Plants generate large amounts of energy and are reliable.