Thermistors and superconductor –
what do you mean by the term Thermistor and superconductor ? How a Thermistors is different from ordinary resistance and what are the applications of Thermistors and super-conductors?
Before to learn about this topic Thermistors and superconductor , students must have to learn about resistance and resistivity;
It is a heat sensitive device whose resistivity changes very rapidly with change of temperature . The temperature coefficient of resistivity of a thermistors is very high , which may positive or negative . a thermistors can have a resistance in the range of 0.1 ohm – 107 ohm .
Uses of thermistors –
Thermistors are used in industry as temperature control unit , remote sensing, picture tube and to measure very high temperature change .
A thermistors differs from an ordinary resistance in the following ways –
(i) The temperature coefficient of resistivity of a thermistors can be both positive and negative .
(ii) The resistance of thermistors changes very rapidly with change in temperature
(iii) temperature coefficient of resistivity of a thermistors is very high .
Super-conductivity is the property due to which a metal alloy or metal oxide shows zero resistance at a very low temperature . or in another words we can say that certain metals or alloys at very low temperature lose their resistance and becomes zero .
Application of super-conductors –
(i) It is used to produce very high speed computers ,
(ii) it is used to transmission of electric power ,
(iii) It is used to make very strong electromagnet ,
(iv) It is used in material science research and high energy particle .