energy stores

• how do you reduce energy loss?

  thermal insulation and lubrication
• how do you reduce heat loss by convention?

  -foam seals around doors and windows

  -curtains
• what is convection?

  -heat that is transferred through liquids and gases
• how do you reduce heat loss by conduction?

  -thick walls made from low thermal conductivity materials

  -cavity walls (2 layers of bricks with an air gap that reduces conduction)

  -fill cavity walls with insulating foam

  -double glazing
• how to reduce friction?

  -use oli

  -make cars and airplanes streamline
• why do you want to reduce friction?

  friction reduces the efficiency of energy transfer
• in conduction what energy store is energy transferred to?

  kinetic due to the notions of the vibrating atoms
• what happens to the energy in conduction?

  When the particles vibrate the energy is passed along the vibrations until its evenly spread out
• why does conduction occur in solids?

  -particles are held together close which means there is lots of collusions to pass on the energy
• what is thermal conductivity?

  How well an object transfers energy
• how does convection work?

  -particles near heat source will gain kinetic energy and spread out becoming less dense which leads to them rising above the cooler particles which sink down.

  -those particles with the energy will then lose it and those cooler particles will gain energy

  -this cycle is called a convection current
• what do you do to reduce convection?

  -stop the free flow of fluids
• what is the difference between convection and conduction?

  In conduction heat energy is transferred by particles whereas in convection the particles move themselves
• how can energy be transferred without particles?

  through a vacuum
• what happens when energy is transferred by radiation

  uses a vacuum
• why does infrared radiation get emitted?

  the hotter the object the more radiation it emits
• what is the symbol for power

  Watts
• what is the symbol for energy?

  joules