energy transfer by appliances

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

  It is the rate at which energy is transferred
• What are the two main categories of energy transfer in appliances?

  • Transfer to kinetic energy
  • Transfer to thermal energy
• How do a blender and a fan transfer energy?

  They transfer electrical energy to kinetic energy
• What type of energy do the kettle and iron primarily transfer?

  They transfer electrical energy to thermal energy
• How do power ratings differ between appliances designed for thermal energy and kinetic energy?

  Thermal energy appliances have higher power ratings
• What is the energy transfer rate of one watt?

  One joule per second
• What does the power rating of an appliance indicate?

  Energy transferred every second in joules
• How do you calculate total energy transferred using power ratings?

  Multiply power by time
• What is the formula for energy in joules?

  Energy = Power × Time
• How do you convert joules to kilojoules?

  Divide by 1,000
• How many seconds are in 5 minutes?

  300 seconds