(a) When is more power delivered to a light bulb — just after it is turned on and the glow of the filament is increasing or after the glow becomes steady ? Why ? OR (b) A battery is connected first across the series combination and then across the parallel combination, of three resistances $R$, $2R$ and $3R$. In which of the three resistances will power dissipated be maximum in the two cases ? Justify your answer.