making use of energy

• Ways energy can be transferred

  • Conduction
  • Convection
  • Radiation
• Conduction


  Heat is transferred through a solid
• Convection


  Heat is transferred through a gas or liquid by the movement of particles
• Radiation


  Heat is transferred by electromagnetic waves without the movement of matter
• Energy use in the home can be reduced by improving insulation and reducing air gaps
• The more efficient an appliance is, the better the energy efficiency rating will be
• Appliances with the same size and quality can have different energy ratings
• Power rating


  Allows comparison of power use of appliances
• Power rating


  • LED lamp has a power rating of _w
• Electric motors have lower running costs than diesel or petrol engines
• Fuel efficiency and carbon footprint of vehicles can be improved by reducing air resistance and weight
• Insulation reduces heat loss by conduction


  It prevents air circulating and reduces heat loss
• Loft insulation reduces heat loss by reflecting heat in multiple ways
• Payback time


  The time it takes to save enough money from reduced energy costs to cover the initial cost of energy efficiency measures
• Upgrading wall insulation can have a payback time of around 14 years