GATE Exam > GATE Questions > Thermistors have ________.a)positive tempera...
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Thermistors have ________.
- a)positive temperature coefficient
- b)negative temperature coefficient
- c)zero temperature coefficient
- d)infinite temperature coefficient
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Thermistors have ________.a)positive temperature coefficientb)negativ...
Thermistor generally has a negative temperature coefficient of resistance. With an increase in temperature, the resistance of a thermistor decreases.
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Thermistors have ________.a)positive temperature coefficientb)negativ...
Understanding Thermistors
Thermistors are temperature-sensitive resistors used in various applications, including temperature sensing and control. They exhibit a significant change in resistance with temperature variations, making them valuable components in electronic circuits.
Types of Thermistors
There are mainly two types of thermistors based on their resistance-temperature characteristics:
Explanation of NTC Thermistors
The correct answer, option 'B', refers to NTC thermistors, which are the most common type used in applications requiring temperature measurement and control. Here’s why NTC thermistors have a negative temperature coefficient:
Conclusion
In summary, thermistors, particularly NTC types, are crucial in many electronic applications due to their ability to provide precise temperature-related resistance changes, thereby making option 'B' the correct answer.
Thermistors are temperature-sensitive resistors used in various applications, including temperature sensing and control. They exhibit a significant change in resistance with temperature variations, making them valuable components in electronic circuits.
Types of Thermistors
There are mainly two types of thermistors based on their resistance-temperature characteristics:
- Positive Temperature Coefficient (PTC): These thermistors increase resistance with an increase in temperature.
- Negative Temperature Coefficient (NTC): These thermistors decrease resistance with an increase in temperature.
Explanation of NTC Thermistors
The correct answer, option 'B', refers to NTC thermistors, which are the most common type used in applications requiring temperature measurement and control. Here’s why NTC thermistors have a negative temperature coefficient:
- Resistance Characteristics: As temperature rises, the thermal energy increases, causing more charge carriers (electrons) to be available for conduction. This results in a decrease in resistance.
- Material Composition: NTC thermistors are typically made from ceramic materials that exhibit this property. The materials are doped with metal oxides, which enhance their sensitivity to temperature changes.
- Applications: NTC thermistors are widely used in temperature sensors, inrush current limiters, and temperature compensation in circuits due to their predictable resistance change.
Conclusion
In summary, thermistors, particularly NTC types, are crucial in many electronic applications due to their ability to provide precise temperature-related resistance changes, thereby making option 'B' the correct answer.
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Thermistors have ________.a)positive temperature coefficientb)negative temperature coefficientc)zero temperature coefficientd)infinite temperature coefficientCorrect answer is option 'B'. Can you explain this answer?
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