Learn the basics of Electrical Engineering.

Relationship between Resistance and Temperature

The electrical resistance of the material depends on its length, area, and resistivity by the following relationship.
Resistance = [Resistivity * Length] / Area 
  • Resistivity = Ω-m
  • Area = m2
  • Length = m

Today you'll learn the relationship between resistance and temperature.
relationship between resistance and temperature

The resistivity (Ω-m) is the temperature dependent physical property of the material. A change in temperature impacts the resistivity of material which in turn alters the resistance.

Technically the rate of change of resistance is measured in terms of the temperature coefficient of the material. Greek symbol α represents temperature coefficient of the material.

The equation below is used to find the resistance of object at any temperature when the resistance at some specific temperature is known.
R2 = R[ 1 + α(T- T1)]
R= Conductors resistance at temperature T1
R= Conductors resistance at temperature T2
α1 = Temperature coefficient of the material
T= Reference temperature at which  α1 is specified
T= Conductor present temperature

The temperature coefficient of commonly used materials at 0, 20° C is given below:
Materials at 20 degree C at 0 degree C
Aluminum 0.00391 0.00424
Copper 0.00393 0.00427
Iron 0.0055 0.00618
Silver 0.0038 0.00412

Example: Copper wire has the resistance of 15 ohms at 20° C. Calculate the resistance at 80° C

Solution: R2 = R[ 1 + α(T- T1)]

R2 = 15 Ω [ 1 + 0.00393 (80 - 20)]

R2 = 15 Ω ( 1.2358 )

R2 = 18.53 Ω

Positive temperature coefficient vs Negative temperautre coefficient

The material whose temperature increases with increase in temperature is known as positive temperature coefficient. While material whose temperature decreases with increases in temperature is known as positive temperature coefficient.


  1. Thx I'm actually loocking for a relationship btw raise of the temp function of time in a resistance.Have you any link in this field?

  2. what is the area in the you are mentioning about. ie in Resistance = [Resistivity * Length] / Area

  3. On the off chance that this is the thing that your life partner implies, you can regularly utilize this uncertainty, regardless of whether it's just an extremely little uncertainty I don't love my partner anymore, to purchase time for your marriage.

  4. Knows more about relationships? Then give a helping hand to your young ones. Let's grow the world knowledge. Head over to Thinkle Reletionship and help a seeker please.

  5. You are not the only one on this side of the boat. Indeed there are a few people whose relationship issues are more horrendous than the one you may be imagining that you have. cuckold sites

  6. Will you be curious to learn about our future? Do you want the appropriate guidance for each other, relationships, career and funds? accurate psychic

  7. All these are utilized for heat control in advanced temperature controllers.Flexelec Malaysia

  8. The two statements below this line " Positive temperature coefficient vs Negative temperautre coefficient" cannot both be right.

  9. find the resistance of copper wire if cross sectional area =2.5mm and length = 1000m and temperature =50degree

  10. A weather vane is a tool that is used to identify the direction of the wind. Weather vanes are usually found on top of buildings and in other open air places like gardens, lawns, barns, garages, and more. Barrackpore