2023

• reneawable energy e.g

  -geothermal

  -wind power

  -solar power

  -tides

  -waves

  -hydro

  -bio-fuel
• equation links to current, resistance,pd

  V=IR
• random error

  differnce btw 2 values
• how does step up transformer increase the efficiency of the national grid

  -Pd is increased

  -and current decreases

  -so energy is lost in the transmission cables
• if resistence increases

  the current decreases so the pd decreases too
• name given to checking process

  peer review
• Nuclear radiation causes the increased risk of cancer why ?

  brudda cus it is ionising
• unit for the activity of a radioactive source

  bq
• why is the count-rate less than the activity of the sample

  -cus not all the radiation is emitted

  -because the radiation spreads out
• alpha radiation

  is not detetcted beyond 5cm in air
• radioactive decay is a random process

  yes !
• Why use metal instead of plastic

  Cus metals have a higher thermal conductivity, which allows a greater rate of thermal energy transfer
• What property of air allows a small change in internal energy to cause a large temp change to the air in the chamber

  a low specific heat capacity
• one way to increase the speed at which the wheel turns

  lubrication