Thermistor

TL;DR

Thermistors are special resistors that exhibit a negative temperature coefficient, allowing for precise temperature measurements and control.

Transcript

hello friends in this video we are going to study about thermistor we will study its principle of walking construction its characteristics and then its applications so let us start with our topic thermistor it is the contraction of the term thermal resistor so we can say that it is made of two terms thermal plus resistor so we can say that thermist... Read More

Key Insights

• 👻 Thermistors are made from materials with negative temperature coefficients, allowing for accurate temperature measurements.
• 💱 They can measure temperature variations by observing the change in resistance, which is proportional to temperature.
• 🚱 Thermistors have non-linear resistance-temperature characteristics, unlike resistance temperature detectors and thermocouples.
• ✊ They find applications in temperature measurement, control, compensation, power measurement, and other fields.
• ☄️ Thermistors come in various shapes like beads, rods, and discs, with different sizes for different applications.
• 😑 The resistance-temperature relationship of a thermistor can be defined mathematically using an exponential expression.
• ⚡ Thermistors can exhibit voltage-current characteristics, with an initial linear relationship and then a non-linear relationship.
• ⌛ The time delay for a thermistor to reach maximum current is influenced by the applied voltage.

Questions & Answers

Q: What is a thermistor and how does it differ from a regular resistor?

A thermistor is a special type of resistor whose resistance changes with temperature, whereas regular resistors have a constant resistance regardless of temperature. Thermistors are made from materials with negative temperature coefficients.

Q: How are thermistors used to measure temperature?

Thermistors can measure temperature by connecting them in a circuit with a micro ammeter. As temperature increases, the resistance of the thermistor decreases, causing an increase in current flow. This change in current is directly calibrated to the change in temperature.

Q: Can thermistors be used for temperature control?

Yes, thermistors can be used for temperature control by combining them with relays. When the temperature exceeds a set range, the relay is activated and cuts off the current supply to control the temperature.

Q: What are the advantages of using thermistors for temperature measurements?

Some advantages of thermistors include their compact size, rigidity, low cost, stability, high sensitivity, fast response time, and resistance to environmental conditions such as shocks and vibrations.

Summary & Key Takeaways

• Thermistors are special resistors whose resistance changes with temperature and are made from materials with negative temperature coefficients.

• They are highly sensitive and can measure temperature variations accurately, with a change in resistance proportional to temperature.

• Thermistors have a wide range of applications, including temperature measurement, control, compensation, power measurement, and more.