Energy

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1. Name and describe the four energy pathways/carriers

  • Mechanical-force Electrical-light Heat-current Radiation-current
  • Mechanical-current Electrical-force Heat-light Radiation-Temperature change
  • Mechanical-work done by a force, Electrical-work done by a current, Heat-temperature change, Radiation-light eg infrared
  • Mechanical-light Electrical-force Heat-current Radiation-force
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2. Elastic potential energy formula

  • 0.5 x spring constant x extension^2
  • 0.5 x extension x height
  • 0.5 x spring constant x extension

3. Change in thermal energy formula

  • change in thermal energy= mass x 0.5 x temperature
  • change in thermal energy= mass x specific heat capacity x temperature
  • Change in thermal energy = mass x specific heat capacity x temperature change
  • change in thermal energy =mass x specific latent heat x speed

4. Efficiency formula

  • temperature change/total energy
  • useful energy/total energy transfer
  • temperature/useful energy
  • total energy/useful energy

5. Wasteful energy is...

  • Stored
  • Wasted to the surroundings
  • Not usefully transferred
  • Transferred to another store
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