How Do the Tester Works???

Discussion in 'General Electronics Chat' started by Rallabandi, Aug 19, 2014.

  1. Rallabandi

    Thread Starter New Member

    Aug 19, 2014
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    0
    Hello Sir....
    Since Many Days i am having a small Doubt regarding the working of the testers..as to complete the circuit while we test the power in any electronic- Devices with a tester..we will touch the external metal provide...in one of the replies you told that the Neon bulb requires very less current to glow...but if any device..i mean any load is provided there..it should not work with such a low current.????and also i have a doubt..we won't get a shock even we touch the metal..is this due to the low current flowing.???
    I also would like to Know..whether the wooden floors, plastic materials...these all are the pure Insulators or Not... if they conduct upto what extent they will conduct????

    Hope you will help me out sir
    Thanks&Regards
    Rallabandi.
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    We do not see the things you see in your mind. What are you referring to here?

    There is no such thing as a pure insulator, everything will conduct after a certain point. What we call insulators typically won't conduct under normal use.
     
  3. Rallabandi

    Thread Starter New Member

    Aug 19, 2014
    2
    0
    Insulators will work only above room temperature...u just tell me what is the working process and why don't we get shock....
    Please let me Know that sir.
    Thanks&Regards.:confused::(
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    This simply isn't true. There are insulators at lower temperatures.

    It has to do with the way the valence electrons are in the atoms & molecules that make up a lattice and the energy (not always heat) required to allow them to leave a local atom/molecule.

    See here for a decent introduction.
     
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