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A circuit has a fuse of 5 A. What is the...

A circuit has a fuse of 5 A. What is the maximum number of 100 W (220 V) bulbs that can be safely used in the circuit ?

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The correct Answer is:
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Suppose x bulbs can be used safely.
Now, Power of 1 bulb = 100 W
So, Power of x bulbs, `P` = 100 `xx` x watts
Potential difference, `V` = 220 volts
`" "` Current, `I` = 5 amperes
Now, `" "` Power, `P = VxxI`
So, `" " 100xx x = 220 xx 5`
`" "x= (220xx5)/(100)`
`" "x= 11`
Thus, a maximum number of 11 bulbs can be used.
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