Calculate the resistance of an electric bulb which allows a $10 \ A$ current when connected to a $220 \ V$ power source. (in $\Omega$)

Which symbol is used for the resistivity of a conductor?

Why are alloys used to make standard resistors?

Describe the nature of the $V-I$ graph for a nichrome wire. ($V =$ Potential difference,$I =$ Current)
$A$ metallic wire of $625 \, mm$ length offers a $4 \, \Omega$ resistance. If the resistivity of the metal is $4.8 \times 10^{-7} \, \Omega \cdot m$,calculate the cross-sectional area of the wire.

According to Ohm's law,which of the following statements is correct?

State $Ohm's$ law. How can it be verified?