Thermal Energy transfers

• What are the variables?

  1. Independent variable -  Number of layers of insulating material
  2. Dependent variable - Temperature change of water 
  3. Control variables - Amount of water in each beaker, starting temperature of the water in each beaker
• Who is presenting the installation required practical for GCSE physics?


  Mr. Reese
• What materials are suggested for creating insulation in the experiment?


  Bubble wrap and elastic bands
• How can you increase the layers of insulation in the experiment?


  By wrapping more layers of bubble wrap around the beaker or can
• What is the purpose of the insulation in the experiment?


  To reduce heat loss due to conduction
• What additional measure is taken to reduce energy loss to the table?

  Adding layers on the bottom of the can
• What is used to cover the top of the can to reduce convection?


  A cardboard lid
• What is the starting temperature of the water in the experiment?


  85 degrees Celsius
• What should you do to ensure a fair test when filling the cans or beakers?


  Use the same amount of water each time
• What happens to the temperature of the can with no insulation over 20 minutes?


  It decreases in temperature much more rapidly
• How does the temperature change of the can with eight layers of insulation compare to the others?


  It decreases the slowest
• What are the results expected from the experiment regarding insulation layers?


  • More layers of insulation reduce heat loss.
  • The can with eight layers retains heat better than those with fewer layers.
  • Conduction is reduced more effectively with increased layers.
• What is the relationship between the number of insulation layers and heat loss?


  More insulation layers lead to less heat loss
• What should be plotted on the graph after the experiment?

  Temperature on the y-axis and time on the x-axis
• Why is the can with eight layers a better insulator than the can with two layers?


  Because conduction is reduced more effectively with eight layers