The resistivity of all pure metals increases with increase in temperature.
A student carries out an experiment and plots the $V-I$ graph of three samples of nichrome wire with resistances $R_1, R_2$ and $R_3$ respectively (Figure.). Which of the following is true?
What is the unit of resistance?
Calculate the equivalent resistance in the combination shown in figure below
$1\, kW h =3.6 \times 10^{6}$ joule.