Physics » Energy

Energy

KS3 - Energy recap

Energy is the ability to do work.

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BBC Bitesize - Energy

Key Words

Energy stores - where energy is stored. 8 energy stores are:

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

Energy transfer - energy is moved from one store to another.

Work done - same as energy transfer.

Closed systems - somewhere where energy does not enter or leave.

Conservation of Energy Principle - Energy can be transferred usefully, stored or dissipated but can never be created or destoyed.

Dissipated energy - when energy is transfered not all of the energy moves usefully to a store, instead it becomes wasted.

Joule (J) - What energy is measured in. 1000 J = 1 kJ (kilo-joule).

 

Also see Energy transfers by heating, Energy Resources


 


EQUATION Work Done with force


EQUATION Kinetic Energy


EQUATION Gravitational Potential Energy


EQUATION Elastic Potential Energy


EQUATION Power with work done


EQUATION Efficiency