The resistance of a metal wire changes with temperature. This means that a wire could be used to sense changes in temperature, in the same way that a thermistor is used.

Suggest one advantage a metal wire has over a thermistor.

 

Use the resistivity value quoted in given table. Calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances of: $1.0\Omega$ .

Use the resistivity value quoted in given table. To calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances$5.0\Omega$.

Use the resistivity value quoted in given table to calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances of:

$10\Omega$.

$1.0c{m}^3$Of copper is drawn out into the form of a long wire of cross-sectional area $4.0\times {10}^{-7}{m}^2$. Calculate its resistance. (Use the resistivity value for copper from Table)

A $1.0m$, length of copper wire has a resistance of $0.50\Omega$, then calculate the resistance of a $50.m$, length of the same wire.

A$1.0m$ Length of copper wire has a resistance of $0.50\Omega .$ What will be the resistance of $1m$ length of copper wire having half the diameter of the original wire?

An element of an electric fire is made up from a length of nichrome wire of diameter $0.40mm$ and length $5.0m$. The resistance of this element is $R_1.$ Another element, also made from nichrome, for a different electric fire, has a length of $2.0m$ and a diameter of $0.20mm.$ This element has a resistance of $R_{2.}$ What is the relationship between $R_1$ and $R_2$ ?