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  • Internal: energy present within molecules in form of kinetic due to motion of particles in matter and potential depending on separation between molecules
  • sound
  • Radiant: in the form of electromagnetic waves e.g. x-rays, infrared, visible etc.
  • Electrical: due to charge or current
  • Gravitational Potential: possessed by an object by virtue of its position in a gravitational field
  • Elastic: possessed by an object by virtue of its state of deformation
  • Chemical: possessed by a fuel by virtue of its chemical composition
  • Nuclear: energy in nucleus of atoms due to nuclear composition
  • Sources of energy that can be replaced or replenished each day by earth's natural processes
  • Efficiency = useful energy/power output / total energy/power input x 100%
  • The efficiency of a system isthe ratio of the useful energy output from the system to the total energy input.
  • Energy efficiency
  • If a system has high efficiency, this means most of the energy transferred is usefulIf a system has low efficiency, this means most of the energy transferred is wasted
  • Sources of energy that are finite and cannot be renewed everyday because it takes million years to replace them
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