Understanding Thermocouples

Discussion in 'Homework Help' started by paiggey, Feb 9, 2009.

  1. paiggey

    Thread Starter New Member

    Feb 9, 2009
    im a student doing my physics coursework going towards my a level

    i have to put the cold junction of a thermocouple into a beaker of iced water and the hot junction of the thermocouple into a beaker of 100degree c water

    I have found that the voltage is so small i am in need of an amplifier (*200)

    when i put both of the junctions into the cold beaker i get a readin of 0.4V and when i put both the ends in the hot beaker i get a negative value of -140mV

    Can someone explain this to me as none of my physics masters can find a reason for this and i have been told that at the same temperature the thermocouple should read 0.0

    greatly appreciated

    Adam Paigge
  2. bertus


    Apr 5, 2008