COURSES TAUGHT BY PROF. VALDENILTON: Basic Electronics Course Level 1 and 2 Online (100% in VIDEO) https://go.hotmart.com/S90922297H?dp=1 LCD/LED Digital TV Repair Course (100% in PDF) https://technologycursos.wixsite.com/... Transformer Winding Course (100% in PDF) https://hotm.art/Curso-de-enrolamento... SHARE THIS VIDEO WITH THOSE YOU LOVE: • Learn how the temperature coefficient... COURSES TAUGHT BY OTHER TEACHERS: Basic Electronics Course (focused on repair) https://hotm.art/Curso-de-eletronica-... Basic Electronics Course (with general focus) https://hotm.art/Curso-de-eletronica-... Cell Phone Repair Course (full version) 5.0) https://hotm.art/Conserto-de-celular-top Notebook Motherboard Repair Course https://hotm.art/Conserto-de-placa-ma... Voltage Inverter Manufacturing and Repair Course https://hotm.art/Aprenda-a-fazer-inve... Photovoltaic Solar Energy Course https://hotm.art/Curso-energia-solar-... Complete Digital Marketing Course (from scratch) https://hotm.art/Curso-de-Marketing-D... SUBSCRIBE TO OUR CHANNEL BY CLICKING THE LINK BELOW: / @technologycursosoficial The resistor with temperature coefficient is not very common to be found in electronic circuit boards, which is why you should be concerned when you need to replace it when you come across one that is defective. In today's class you will learn how the temperature coefficient keeps the resistor within tolerance. And to make it easier for you to understand, I will calculate the range of resistance variation of a 1MΩ metal film resistor - ±1% - 100ppm/°C when subjected to a negative temperature variation of -45°C and a positive temperature variation of +115°C. It is known that one of the factors that influences resistance is the temperature of the material. Therefore, when a resistor is subjected to a temperature increase, whether negative or positive, its resistive value tends to vary. The resistance variation of the resistor due to the increase in temperature can influence the work of the load, which is why manufacturers use resistors with a temperature coefficient. The temperature coefficient is a parameter that determines that the resistor does not exceed its nominal resistance value determined for room temperature, when it is subjected to a temperature increase. The temperature coefficient can be implemented in resistors with four and five colored rings, the latter being the most accurate. The resistors chosen in their vast majority to receive the temperature coefficient are those with metal film, precisely because of the precision of the resistive film. It is not common to find carbon film resistors with a temperature coefficient because carbon has the electrical characteristic of decreasing resistance as the temperature rises. The temperature coefficient is indicated on the sixth ring of the metal film resistor, and its value is read in parts per million per degree Celsius (ppm/°C). The resistor identification table has a specific column for the temperature coefficient, which indicates the values ​​in ppm/°C through the colors of the rings. There is a formula that calculates the temperature coefficient of resistors in a very simple way: Vnt = Vn (1± ΔT . CT) Where: Vnt = Nominal variation of resistance at a given temperature Vn = Nominal value of the resistor (in Ohms) 1 = Constant ΔT = Temperature variation (in degrees Celsius) CT = Coefficient (in parts per million per degree Celsius) With this formula, it is possible to determine the range of resistance variation of the resistor when it is subjected to a temperature rise. Conclusion: I hope that by the end of this lesson you will be able to understand how the temperature coefficient keeps the resistor within tolerance. Hello, I am Professor Valdenilton, Technical Coordinator of the Electronics courses taught by Technology Cursos. I love transforming people's lives through teaching. My goal is to teach people like you to fix the electronic equipment they love, helping in every way possible. INFORMATION: Our website: https://technologycursos.wix.com/tech... Business contact: [email protected] Whatsapp Center: (82) 9 8706-9200 (Only by messages or audio)