Which of the following has a negative temperature coefficient of resistance?a)Thermistorb)capacitorc)transistord)diodeCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Thermistor
Thermistors are temperature-sensitive resistors that exhibit a negative temperature coefficient of resistance, meaning that their resistance decreases as temperature increases.

Explanation:
- Thermistors are made of semiconductor material, such as metal oxides like manganese, nickel, or cobalt, that exhibit a decrease in resistance with an increase in temperature.
- This property makes thermistors suitable for temperature measurement, control, and compensation in various electrical circuits.
- The negative temperature coefficient of resistance in thermistors is due to the increased number of charge carriers at higher temperatures, which results in a decrease in resistance.
- This unique characteristic allows thermistors to provide accurate and reliable temperature sensing in applications like thermostats, temperature controllers, and thermal protection devices.
In contrast, capacitors, transistors, and diodes do not exhibit a negative temperature coefficient of resistance. Capacitors have capacitance that is independent of temperature, while transistors and diodes have a positive temperature coefficient of resistance, where their resistance increases with temperature.

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An electrical resistance strain gauge of resistance 120Ω has a gauge factor of 2. It is bonded to a steel specimen (modulus of elasticity, E = 2 * 1011 N/m2) for measuring strain. Estimate: (2002)(

Which of the following is correct for thermistors?

Most metallic conductors have a ________.

Thermistors have ________.

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