Photoresistors are used to control the current in the electrical circuit by changing the illumination, Using photoresistors, they determine the quality of surfaces, control the dimensions of products, etc. Thermistors are used for remote temperature measurement in those places where liquid thermometers are unsuitable, for example, for measuring the temperatures of liquefied gases , melting temperatures of metals. Thermistors are used in various automatic devices as sensors, such as fire alarms.
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