Science- Energy

• Energy is the ability to move something or do work. It is measured in joules (J) or kilojoules (kJ)
• Heat / Thermal Energy is anything with a temperature above absolute zero ( -273°c ) has heat energy.

  That means everything has some heat energy.

  The hotter something is the more heat it has. Example: warmth of sun, heat from heater, baking in an oven .
• Kinetic Energy: anything that is moving has kinetic energy.
• Sound energy : anything noisy gives off sound energy.
• Light energy: anything luminous gives off light energy.
• Chemical energy : anything with stored energy which can be released by a chemical reaction has chemical energy. E.g. food , batteries, fuels
• Electrical energy : electrical energy is very useful , because it can be converted into other forms of energy - wherever there’s a current flowing there’s electrical energy. E.g. TV, toaster , batteries
• Potential energy: anything above the ground has gravitational potential energy. i.e. Anything that can fall, like climbers , planes , ski jumpers
• Nuclear Energy: released only from nuclear reactions. E.g. the sun and all the stars.
• Elastic energy: anything stretched has elastic energy. E.g. Rubber bands , hair ties , elastic .
• Law of conservation of Energy: energy cannot be created or destroyed, only changed from one form to another
• To find the efficiency of a proccess , you put the amount of useful energy over the total energy and multiply by 100.
• Sources of Energy

  Renewable energy

  • Wind
  • Solar
  • Hydropower / tidal / wave
  • Geothermal
  • Biomass

  Non-Renewable Energy

  • Fossil fuels
  • Gas
  • Coal
  • Petrol / diesel
  • Oil
  • Peat / Turf
  • Nuclear