energy

• energy is ..... between stores but not .... or ....

  transferred ,created ,destroyed
• what are the 4 main energy transfers

  mechanically

  electrically

  heating

  radiation
• what is work done

  when a force moves an object
• wasted energy is often transferred as....

  thermal
• what does dissapated mean

  spreads out and is less useful
• lubrication

  reduces friction
• insulation

  reduces heat loss
• if thick walls low

  thermal conductivity
• how to reduce unwanted energy transfers

  cavity wall insulation,double glazing, draught excluders
• what does high conductivity mean

  loses heat quickly
• rate of cooling is faster is

  temp difference is high

  object has a large surface area

  materials conduct heat well
• give two renewable sources

  geothermal,biofuel,solar
• give non renewable

  coal ,oil,nuclear
• advatanges of renewable

  sustainable and low emission
• disadvantage of non renewable

  unrealiable,low energy density
• advantage of non renewable

  reliable ,lots of energy
• disadvantage of non renewable

  pollution,finite
• trends in uk use

  reducing use of fossil fuels

  more renewable energy in the mix

  still use gas