A copper wire has a resistance of 20 ohm at a temperature of 0 degree celsius and 28 ohm at 100 degree celsius.what is temperature coefficient of resistivity of copper?
To find the temperature coefficient of resistivity of copper, we can use the following formula:
TCR = (R2 - R1) / (R1 * (T2 - T1))
Where:
TCR = Temperature Coefficient of Resistivity
R1 = Resistance at the initial temperature (0 degrees Celsius in this case)
R2 = Resistance at the final temperature (100 degrees Celsius in this case)
T1 = Initial temperature (0 degrees Celsius in this case)
T2 = Final temperature (100 degrees Celsius in this case)
Let's substitute the given values into the formula:
TCR = (28 ohm - 20 ohm) / (20 ohm * (100 degree Celsius - 0 degree Celsius))
Simplifying further:
TCR = 8 ohm / (20 ohm * 100 degree Celsius)
TCR = 0.004 ohm/degree Celsius
Therefore, the temperature coefficient of resistivity of copper is 0.004 ohm/degree Celsius.