JEE MAIN - Physics (2014 (Offline) - No. 13)
In a large building, three are $$15$$ bulbs of $$40$$ $$W$$, $$5$$ bulbs of $$100$$ $$W$$, $$5$$ fans of $$80$$ $$W$$ and $$1$$ heater of $$1$$ $$kW.$$ The voltage of electric mains is $$220$$ $$V.$$ The minimum capacity of the main fuse of the building will be:
$$8$$ $$A$$
$$10$$ $$A$$
$$12$$ $$A$$
$$14$$ $$A$$
Explanation
Total power consumed by electrical appliances in the building, $${P_{total}} = 2500W$$
Watt $$=$$ Volt $$ \times $$ ampere
$$ \Rightarrow 2500 = V \times {\rm I}$$
$$ \Rightarrow 2500 = 220$$ $${\rm I}$$
$$ \Rightarrow I = {{2500} \over {220}} = 11.36 \approx 12A$$
(Minimum capacity of main fuse)
Watt $$=$$ Volt $$ \times $$ ampere
$$ \Rightarrow 2500 = V \times {\rm I}$$
$$ \Rightarrow 2500 = 220$$ $${\rm I}$$
$$ \Rightarrow I = {{2500} \over {220}} = 11.36 \approx 12A$$
(Minimum capacity of main fuse)
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