$A$ metal has a very large number of free electrons and a non-metal has a very small number of free electrons.

The potential difference across the terminals of a cell is $1.5 \ V$. If it is connected with a resistance of $30 \ \Omega$,calculate the current flowing through the circuit. (in $A$)

If $R_{1}$ and $R_{2}$ are the resistances of filaments of a $400 \ W$ and a $200 \ W$ lamp,designed to operate on the same voltage,then

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.

There are two electric bulbs,$(i)$ marked $60\, W, 220\, V$ and $(ii)$ marked $100\, W, 220\, V$. Which one of them has higher resistance?

Why is an ammeter likely to be burnt if you connect it in parallel?