Question

What is the temperature coefficient of copper?

Answer 1

Temperature coefficient:

• It could be defined as the change in the electrical conductivity of any material or substance when a change in temperature is made.
• It depends on the collision between the electrons within the metals.
• When one increases the temperature, the collision of electrons becomes faster and more rapid, hence resistance increases with rising in temperature.
• The relation between temperature and resistance ${\mathrm{R}}_0\mathrm{and}{\mathrm{R}}_{\mathrm{T}}$is approximately given as
• $$\begin{gathered} {\mathrm{R}}_{\mathrm{T}}={\mathrm{R}}_0[1+\mathrm{\alpha }(\mathrm{T}-{\mathrm{T}}_0\left)\right]; \\ {\mathrm{R}}_{\mathrm{T}}={\mathrm{R}}_0[1+\mathrm{\alpha }(∆\mathrm{T}\left)\right], \\ \mathrm{where}, \\ {\mathrm{R}}_0\to \mathrm{resistance}\mathrm{at}0°\mathrm{C} \\ \mathrm{T}\to \mathrm{Temperature} \end{gathered}$$
• The temperature coefficient of copper is $0.393\%$per degree celsius.
• In other words, if the temperature increases by$1°\mathrm{C}$then the resistance increase by$0.393\%.$