The electrical resistance of the material depends on its length, area, and resistivity by the following relationship.

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.

Resistance = [Resistivity * Length] / Area

Where

- Resistivity = Ω-m
- Area = m
^{2} - Length = m

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.

R

R

α

T

T

The temperature coefficient of commonly used materials at 0, 20° C is given below:

**R**

_{2}= R_{1 }[ 1 + α_{1 }(T_{2 }- T_{1})]*where*R

_{1 }= Conductors resistance at temperature T_{1}R

_{2 }= Conductors resistance at temperature T_{2}α

_{1}= Temperature coefficient of the materialT

_{1 }= Reference temperature at which α_{1}is specifiedT

_{2 }= Conductor present temperatureThe 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: R

_{2}= R_{1 }[ 1 + α_{1 }(T_{2 }- T_{1})]
R

_{2}= 15 Ω [ 1 + 0.00393_{ }(80_{ }- 20)]
R

_{2}= 15 Ω ( 1.2358 )**R**

_{2}= 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.

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?

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

ReplyDeleteOn 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.

ReplyDeleteKnows 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.

ReplyDeleteYou 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

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

ReplyDelete