variable resistor

Discussion in 'Supporting Biology' started by greenfingers, Jul 9, 2019.

  1. greenfingers

    greenfingers Sarah G

    Hi
    Can anyone tell me which size (i.e. ohm's) variable resistors would be suitable for GCSE,many thanks
     
  2. Dod

    Dod

    Depends on what you are proposing to do with them as to what values you would need.
     
  3. Nick Mitchener

    Nick Mitchener COMMITTEE

    If you are talking rheostats, most schools seem to have them around 15-20 ohm, but that does mean that you are better off using them as potential dividers particularly for the req practicals. What do you want to do with them?
     
  4. greenfingers

    greenfingers Sarah G

    required practical I-V characteristics we have 5 but I need to buy more but I have no clue the resistance of them they are old
     
  5. Nick Mitchener

    Nick Mitchener COMMITTEE

    should be written on them, pics?
     
  6. Dod

    Dod

    Ohmmeter across the ones you have will give you the resistance if it is not readable, sometimes stamped in the metal in tiny writing.
     
  7. Potentiometers in the Biology section?
    For what it is worth my reply is in the Physics Department folks.
     
  8. greenfingers

    greenfingers Sarah G

    I know sorry. Just forgot myself I'm a biologist and happened to put it here whilst looking at posts :D