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

  1. Electrical energy transferred into kinetic energy of electric motors

  2. Thermal energy generated due to friction in motors
• Iron and kettle

  Electrical energy transferred into thermal energy
• Hairdryer and washing machine

  Electrical energy transferred into kinetic energy and thermal energy
• Appliances not designed to generate thermal energy or kinetic energy, e.g. television, do not need to be focused on
• Power rating

  Rate at which energy is transferred, 1 watt = 1 joule per second
• Power ratings

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