What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse?

Let us assume the number of bulbs be y.

Power of y bulbs, P=60y

V=220V, I=5A

We know that

P = VI

60y = 220 x 5

60y = 1100

y=18.33

So, number of bulbs required are 18.

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