$4$ bulbs marked $40\, W$, $250\, V$ are connected in series with $250\, V$ mains. The total power is ............. $W$
A$10$
B$40$
C$320$
D$160$
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A$10$
a (a) ${P_S} = \frac{P}{n} = \frac{{40}}{4} = 10\,\,W.$
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