Energy Transfer by Appliances

• What is meant by the power rating of an appliance?

  It is the rate at which energy is transferred
• How do a blender and a fan transfer energy?

  They convert electrical energy to kinetic energy
• What are the two main categories of energy transfer in appliances?

  • Transfer to kinetic energy
  • Transfer to thermal energy
• What is the main purpose of a blender?

  To mix food
• What is the main purpose of a fan?

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

  They transfer electrical energy to thermal energy
• Why do appliances designed to generate thermal energy have higher power ratings?

  They require more energy to heat effectively
• What are the energy transfers in a hair dryer and washing machine?

  • Hair dryer:
  • Transfers electrical energy to kinetic energy (motor)
  • Transfers electrical energy to thermal energy (heating element)
  • Washing machine:
  • Transfers electrical energy to kinetic energy (motor)
  • Transfers electrical energy to thermal energy (heating element)
• What type of appliances are not designed to generate thermal or kinetic energy?

  Television
• What is the energy transfer rate of one watt?

  One joule per second
• How do the energy transfers differ between a blender and a kettle?

  Blender transfers to kinetic energy; kettle to thermal energy