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 reduce heat loss?

  They prevent air from escaping the home
• What is conduction in terms of heat loss?

  Heat loss through solid materials
• Why do houses have thick walls made from low thermal conductivity materials?

  To reduce heat loss by conduction
• What are cavity walls and how do they help with insulation?

  Two layers of bricks with an air gap
• What is the problem with air gaps in cavity walls?

  They allow convection, which can cause heat loss
• How does insulating foam improve cavity wall insulation?

  It reduces convection and conduction
• What is the difference between single glazing 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 in the context of energy transfer?

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

  It prevents energy loss and overheating
• How does lubrication help in reducing friction?

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

  It reduces air resistance and friction
• What is the effect of friction on a bicycle's cogs and chain?

  It makes pedaling harder
• What is the benefit of reducing air resistance in vehicles?

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

  • Thermal insulation
  • Lubrication
• What are the consequences of friction in energy transfer?

  • Reduces efficiency
  • Causes heating of objects
• What are the adaptations in buildings to reduce heat loss?

  • Sealing doors and windows
  • Thick walls with low thermal conductivity
  • Cavity walls with insulating foam
  • Double glazing