energy transfer by appliances

• Domestic appliances


  • Transfer electrical energy into other forms of energy
  • Only need to identify transfers to kinetic energy and thermal energy
• Blender and fan


  Electrical energy transferred into kinetic energy of electric motors
• Iron and kettle


  Electrical energy transferred into thermal energy
• Hairdryer and washing machine

  Electrical energy transferred into both kinetic energy and thermal energy
• Appliances can be divided into two main categories: those that transfer electrical energy into kinetic energy, and those that transfer electrical energy into thermal energy</b>
• Some appliances are designed to do both
• Appliances have a power rating, which is the rate at which energy is transferred
• Power


  The rate at which energy is transferred, measured in Watts (Joules per second)
• Power ratings of appliances

  • Fan: 20 Watts
  • Blender: 400 Watts
  • Kettle: up to 2200 Watts
  • Iron: up to 2400 Watts
• Appliances designed to generate thermal energy usually have a much higher power rating than those designed to generate kinetic energy