The nichrome heating element of a toaster has a resistance at 12Ω when it's red hot (1200°C). What's the resistance of the element at room temperature (27°C)? [temperature coefficient of resistance of nichrome is 0.4×10^-3 °C^-1]

When temperature of the conductor is increased, then the collision frequency between current carries ( electrons ) and atoms increases. This results in

$10$ wires (same length, same area, same material) are connected in parallel and each has $1\Omega$ resistance, then the equivalent resistance will be

A wire has resistance of $12 \Omega$. It is cut into two parts and both have are connected in parallel. The new resistance is?

The voltage - current $(V-I)$ graph of a metallic conductor at two different temperature $T_{1}$ and $T_{2}$ is shown below. At which temperature is the resistance higher?