A thinner nichrome wire will have less resistance than a thicker one.

Resistance is the property of a conductor that opposes the flow of charge through it. It is given by $R=\frac{V}{I}$ where $V=$ potential difference across the conductor and $I=$ current through the conductor.

The resistance of conductor depends on the length, area of cross-section and nature of material of the conductor.

It also depends on the temperature of the conductor.

If $\rho$ be the resistivity of the material of the conductor, $l$ be its length and $A$ be its area of cross-section, answer the following question:

Resistance of a conductor in terms of $\rho$, $l$ and $A$ is given by

Resistance is the property of a conductor that opposes the flow of charge through it. It is given by $R=\frac{V}{I}$ where $V=$ potential difference across the conductor and $I=$ current through the conductor.

The resistance of conductor depends on the length, area of cross-section and nature of material of the conductor.

It also depends on the temperature of the conductor.

If $\rho$ be the resistivity of the material of the conductor, $l$ be its length and $A$ be its area of cross-section, answer the following question:

When a potential difference of $12.5 \mathrm{V}$ is applied across the conductor, $0.5 \mathrm{A}$ of current flows through it. Its resistance is

Metals have very low resistivities because of which they are good conductors of electricity. Resistivities of alloys like nichrome and manganin are $25 – 100$ times more than those of metals while resistivities of insulators are very high.

The resistivities of five materials are given as under:

$\mathrm{P}: 1.70\times {10}^{-8} \mathrm{\Omega m}$

$\mathrm{Q}: 2.60\times {10}^{-8} \mathrm{\Omega m}$

$\mathrm{R}: 5.20\times {10}^{-8} \mathrm{\Omega m}$

$\mathrm{S}: 1.0\times {10}^{13} \mathrm{\Omega m}$

$\mathrm{T}: 110\times {10}^{-8} \mathrm{\Omega m}$

Now answer the following question:

Which of the above material is the best conductor of electricity?