According to Joule's law of heating, the heat produced in a resistor is

When $2 \mathrm{A}$ current is passing through a conductor in $10$ seconds, $80 \mathrm{J}$ heat is produced then find the resistance of conductor.

Find the ratio of resistances for two bulbs of $220 \mathrm{V}-60 \mathrm{W} \mathrm{and} 110 \mathrm{V}-60 \mathrm{W}$.

The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire? 

Write joule's law related to the heating effect of the current.