switch terminology

Discussion in 'Homework Help' started by JDUK, Feb 15, 2012.

  1. JDUK

    Thread Starter New Member

    Feb 15, 2012
    3
    0
    hi,
    as part of an engineering course I am asked to design a new thermostat. The question is based more on the property change of materials and not so much to do with the circuitry, however my design has to include a switch that is activated (to start up the heating system) when a constant power source is stopped (due to the temperature dropping so low that a semiconductor stops conducting).

    So basicly i just need to know the name of such a switch and possibly a few sentences describing it. just to recap i need a switch that is kept off when a power supply is running through/past it, but is turned on when the power stops.. thanks in advance!
     
  2. JDUK

    Thread Starter New Member

    Feb 15, 2012
    3
    0
    alternativley if no such switch exists then could somebody tell me?
     
  3. n1ist

    Active Member

    Mar 8, 2009
    171
    16
    A relay should work. Use either a form B (SPST, normally closed) or form C (SPDT, use the normally closed contact) version.
    /mike
     
  4. JDUK

    Thread Starter New Member

    Feb 15, 2012
    3
    0
    cheers mate!
     
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