Reducing energy loss

• What is the main focus of today's video?

  Reducing unwanted energy transfers
• What are the two main methods discussed for reducing energy loss?

  Thermal insulation and lubrication
• Why is it important to reduce heat energy loss in homes?

  To keep homes warm in cold weather
• What is convection in the context of heat transfer?

  Heat transfer through liquids and gases
• How do foam seals around doors and windows help?

  They prevent air from escaping
• What is conduction?

  Heat loss through a solid
• Why do houses have thick walls?

  To reduce heat loss by conduction
• What is low thermal conductivity?

  Materials that do not conduct heat well
• What are cavity walls?

  Two layers of bricks with an air gap
• How does an air gap in cavity walls affect heat transfer?

  It reduces conduction but allows convection
• What is the purpose of insulating foam in cavity walls?

  To minimize convection and conduction
• What is the difference between single and double glazing?

  Single has one pane; double has two
• How does double glazing reduce heat loss?

  It has an air gap that reduces conduction
• What is friction?

  Resistance when moving over a solid or fluid
• Why is reducing friction important?

  It increases the efficiency of energy transfer
• How does lubrication help in reducing friction?

  By adding oil to moving parts
• How does streamlining vehicles reduce friction?

  It reduces air resistance
• What is the benefit of reducing air resistance in vehicles?

  It allows for less fuel consumption
• What are the key methods to reduce unwanted energy transfers?

  • Thermal insulation
  • Lubrication
• What adaptations do buildings have to reduce heat loss?

  • Sealed doors and windows
  • Thick walls with low thermal conductivity
  • Cavity walls with insulating foam
  • Double glazing
• What are the effects of friction on energy transfer?

  • Reduces efficiency
  • Causes heating of objects
• How can you suggest ways to reduce energy loss in an exam question?

  • Discuss thermal insulation methods
  • Explain lubrication techniques
  • Analyze building adaptations