1. Tardigrade
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  3. Physics
  4. There are 12 bulbs of 40W,4 bulbs of 100W,7 fans of 60W and 1 heater of 1kW in a large building. The voltage of the electric mains for the building is 230V. The minimum capacity of the main fuse of the building should be A.

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Q. There are $12$ bulbs of $40W,4$ bulbs of $100W,7$ fans of $60W$ and $1$ heater of $1kW$ in a large building. The voltage of the electric mains for the building is $230V.$ The minimum capacity of the main fuse of the building should be ______ $A.$

NTA AbhyasNTA Abhyas 2022

Solution:

$P_{\text{total }}=V\times I$
$\left[12 \times 40\right]+\left[4 \times 100\right]+\left[7 \times 60\right]+\left[1 \times 1000\right]=V\times I$
$480+400+420+1000=230\times I$
$\therefore I=\frac{2300}{230}$
$=10A$