Calculating Energy Transferred by Appliances

• What should you be able to calculate by the end of the video?

  The amount of energy transferred by electrical appliances
• What do appliances transfer electrical energy into?

  Other forms such as kinetic energy and thermal energy
• What does the power rating of an appliance indicate?

  How many joules of energy are transferred every second
• How do you calculate the total energy transferred when an appliance is in use?

  By multiplying the power in watts by the time in seconds
• What is the equation for calculating energy transferred?

  • Energy (in joules) = Power (in watts) × Time (in seconds)
• Why is it important to learn the energy calculation equation?

  Because it is not provided in the exam
• If a kettle has a power rating of 2,200 watts and is used for 80 seconds, what is the total energy transferred?

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

  By dividing the joules by 1,000
• What is the total energy transferred when the kettle is used?

  176 kilojoules
• If a fan has a power rating of 20 watts and is used for 1 hour, what is the total energy transferred?

  72,000 joules
• How do you convert 1 hour into seconds?

  By multiplying by 3,600 seconds
• What is the power of the iron if it transfers 600,000 joules in 300 seconds?

  2,000 watts
• If an iron transfers 600,000 joules of energy in 5 minutes, how do you calculate its power?

  By dividing the energy by the time in seconds
• How do you calculate the time an appliance is used if you know the energy transferred and the power?

  By dividing the energy by the power
• If a blender has a power of 400 watts and transfers 48,000 joules of energy, how long is it used?

  120 seconds
• What types of questions can you find in the Orion workbook related to energy transfer?

  • Calculating energy transferred by appliances
  • Applying power ratings in calculations
  • Converting between joules and kilojoules
• What is the final goal of the video?

  To be able to calculate the amount of energy transferred by electrical appliances