How does it work? - Hair dryer

How does it work? - Hair dryer

This animation demonstrates the structure and operation of hair dryers.

Technology

Keywords

hair dryer, household appliance, heater element, thermal overload relay, electric current, electric motor, electric cable, heat transfer, fan, technology, physics

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Scenes

Hair dryer

  • electric network
  • electric cable

Parts

  • air concentrator
  • housing
  • heater element
  • thermal overload relay
  • printed circuit board
  • electric motor
  • fan
  • air inlet
  • switch
  • electric cable

Operation

  • outflowing hot air
  • heater element
  • electric motor
  • incoming air
  • switch
  • electric cable

Overheat protection

  • electric current
  • thermal overload relay closed
  • heating element heats up
  • thermal overload relay opens
  • heating element cools down

Principle of operation

  • evaporation
  • Blowing vapour away and heat transfer causes a higher rate of evaporation.
  • heat transfer

Narration

Water evaporates continuously: water molecules escape from the surface of the water due to their thermal motion. A hair dryer speeds up this process: it intensifies the thermal motion of water molecules by heat transfer and blows the escaping molecules away. These make evaporation and therefore drying one’s hair faster.

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