Energy Transfer by Appliances

• What should you be able to describe by the end of the video?

  Energy transfer in domestic appliances
• What is meant by the power rating of an appliance?

  It indicates the rate of energy transfer
• What are the two main categories of energy transfer in appliances?

  • Electrical energy to kinetic energy
  • Electrical energy to thermal energy
• How does a blender transfer energy?

  It converts electrical energy to kinetic energy
• What is the main purpose of a fan?

  To create air currents through movement
• What type of energy do an iron and kettle primarily transfer?

  They transfer electrical energy to thermal energy
• What type of energy do hairdryers and washing machines transfer?

  Both transfer electrical energy to kinetic and thermal energy
• How does a hairdryer generate heat?

  A heating element heats the air
• What does a washing machine do with electrical energy?

  It heats water and turns the drum
• What is the power rating of a fan?

  20 watts
• What is the power rating of a blender?

  400 watts
• What is the maximum power rating of a kettle?

  2200 watts
• What is the maximum power rating of an iron?

  2400 watts
• Why do appliances designed to generate thermal energy have higher power ratings?

  They require more energy to heat up
• How much energy does 1 watt transfer per second?

  One Joule
• How do you differentiate between appliances that generate thermal energy and those that generate kinetic energy?

  By their design and intended function
• What is the definition of power in terms of energy transfer?

  Power is energy transfer per second
• What does a power rating label indicate?

  The amount of electrical energy transferred
• What are the energy transfers for a hairdryer and washing machine?

  • Hairdryer:
  • Electrical energy to kinetic energy (motor)
  • Electrical energy to thermal energy (heating element)
  • Washing machine:
  • Electrical energy to kinetic energy (motor)
  • Electrical energy to thermal energy (heating element)
• What appliances are not designed to generate thermal or kinetic energy?

  • Television
  • Other similar appliances
• What is the relationship between power ratings and energy transfer in appliances?

  • Higher power ratings indicate faster energy transfer
  • Appliances generating thermal energy usually have higher power ratings