The formula for an electric current is $.....$

Why is parallel arrangement used in domestic wiring?

If resistors are connected in parallel,the voltage across each remains the same.

What is the resistance of insulating materials?

Two identical resistors,each of resistance $2 \Omega$,are connected in turn: $(i)$ in series,and $(ii)$ in parallel to a battery of $12 \text{ V}$. Calculate the ratio of power consumed in the two cases.

An electric bulb works on the heating effect of current.