Two electric lamps of 40W each are connected in parallel across the mains supply. The total power consumed by the two bulbs together is

70W

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80W

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90W

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100W

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Solution

The correct option is C 80W
Given $\frac{V^{2}}{R} = 40 W$
When connected in parallel V remains V and as R is constant
P in each bulb (dissipated) will be 40 w
$\Rightarrow$ Total $=$ 2 x 40 $=$ 80 W

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