Thermistor Simulation | Variation of the Resistance

Physics | Electricity

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General Aim of Thermistor Simulation

The aim of the thermistor experiment is to investigate how the resistance of a thermistor changes with temperature and measuring thermistor resistance.

 

Method of Thermistor Simulation

Variation of resistance of thermistor with temperature using thermistor simulator.

Learning Objectives ILO

  • By the end of the thermistor simulation, the student should be able to:

  • Differentiate between the NTC and PTC type thermistor.
  • Learn how the resistance of a thermistor changes with temperature.
  • Determine the value of activation energy ( band gap energy ) of thermistor material.

Theoretical Background

  • A thermistor is a type of resistor whose resistance is strongly dependent on temperature, more so than in standard resistors. 
  • The word is a combination of thermal and resistor. This temperature dependence is quantified by the thermal coefficient of resistance, which indicates how much the resistance of the thermistor changes per degree of temperature change.

 

Thermistors can be classified into two types: 

  • Positive temperature coefficient (PTC) thermistor.
  • Negative temperature coefficient (NTC) thermistor.

 

  • PTC thermistors can be used as heating elements in small temperature-controlled ovens. 
  • NTC thermistors can be used as inrush current limiting devices in power supply circuits. 
  • Inrush current refers to the maximum, instantaneous input current drawn by an electrical device when first turned on. 
  • Thermistors are available in a variety of sizes and shapes; the smallest in size are the beads with a diameter of 0.15mm to 1.25mm.

 

Principle of Work

  • When the thermistor (negative temperature coefficient thermistor ) is placed in hot water, the resistance of a thermistor decreases with the increasing temperature exponentially in the thermistor simulation.

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