Give advantages of series and parallel connection of resistors.

The total resistance of the circuit increases by connecting the resistors in series hence, the current decreases. Thus, to control the current in the circuit, series connection of resistors is useful. Moreover, the fuse is always connected in series with the mains. Therefore, whenever there is short circuit in any electrical appliance, the fuse wire melts and stops electric current. As a result, damage to electrical appliance can be prevented.

Whereas, the advantage of parallel connection is that when we connect three bulbs in parallel all will get equal voltage and therefore will give equal amount of light irrespective of each other. Secondly, if any appliance is affected/fused, it will not affect the other appliance. When we need more current we use parallel connection as resistance gets decreased resulting in more amount of current.