Power of Electrical 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?

  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
• What types of energy do a blender and a fan primarily transfer?

  Electrical energy to kinetic 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 an iron and a kettle primarily transfer?

  Electrical energy to thermal energy
• What is the design purpose of a kettle?


  To get hot
• What is the design purpose of an iron?

  To get hot
• What appliances transfer electrical energy to both kinetic and thermal energy?

  • Hair dryer: Moves air and heats it
  • Washing machine: Turns drum and heats water
• What is the power rating of the fan?

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

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

  Up to 2,200 watts
• What is the power rating of the iron?

  Up to 2,400 watts
• How do power ratings differ between appliances designed for thermal energy and kinetic energy?

  Thermal energy appliances have higher power ratings
• What does a power rating of one watt represent?

  One joule of energy per second
• How can you use the power rating of an appliance?

  • To calculate total energy transfer
  • To determine energy efficiency
• What should you focus on for exam questions regarding appliances?

  Energy transfers to thermal or kinetic energy
• What is the next topic to be covered in the following video?

  Using power rating to calculate energy transfer
• What is the main focus of the video?

  Energy transfer in domestic appliances
• What should you be able to calculate by the end of this video?

  Energy transferred by electrical appliances
• What do appliances transfer electrical energy into?

  Kinetic energy and thermal energy
• What does the power rating of an appliance indicate?

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

  Power multiplied by time
• What is the equation for calculating energy transferred?

  • Energy (J) = Power (W) × Time (s)
• What is the total energy transferred by the kettle?

  176,000 joules
• How do you convert joules to kilojoules?

  Divide by 1,000
• What is the power rating of the fan in the question?

  20 watts
• How many seconds are in 1 hour?

  3,600 seconds
• What is the total energy transferred by the fan?

  72,000 joules
• How many seconds are in 5 minutes?

  300 seconds
• How do you calculate the power of the iron?

  Energy divided by time
• What is the total energy transferred by the blender?

  48,000 joules
• How do you calculate the time the blender is used?

  Energy divided by power
• What is the time the blender is used for?

  120 seconds
• Where can you find more questions on energy transfer calculations?

  • Orion workbook
  • Link provided in the video
• What should you be able to do after watching the video?

  Calculate energy transferred by appliances