Heating Effect of Electric Current

 Why is negligible heat produced in the connecting wires?

The working of an electric heater depends on:

When a current of $\mathrm{I}$ ampere is passed, through a resistor of $\mathrm{R}$ ohm for $\mathrm{t}$ seconds, the amount of heat produced is :

Elements of heating devices are of:

$100 \mathrm{J}$of heat is produced in $2 \mathrm{s}$in $2 \mathrm{\Omega }$ resistor. Find the potential difference across the resistor.

Why heat is produced when electric current is passed through a conductor?

How does heat produced in a conductor depend on current?

 What are the two important characteristics of material of fuse wire?