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Electrical appliances transfer energy from the power supply, but not all of the energy is used carefully - some always gets wasted

Energy is always conserved (it stays the smae, nothing is lost)

  • When you're using (or making) electricity, no energy is actually lost
  • It's just converted (changed) to different forms
  • Some energy is converted to a useful form (the type of energy we want)
  • The rest is wasted
  • For example, a TV converts electrical energy to useful light and sound, as well as wasted heat

More efficent machines waste less energy

  • The most efficent appliances convert more energy to useful forms and less to waste
  • The efficency of an appliance (or a power station) can be found using this


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