Question

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

Answer 1

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$\scriptsize \sf{Suppose \: x \: bulb \: can \: be \: used \: safely.} \\ \scriptsize \sf{Now, \: power \: of 1 \: bulb \: = 100 \: W \: \: \: \: \: }$

$\sf\scriptsize {So, \: power \: of \: x \: bulb \: = 100 \times watts \: } \\ \sf \scriptsize{Potentail \: difference \: , v \: = 220 \: volts \: \: \: \: \: } \\ \sf \scriptsize{Current, l = 5 \: ampere \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: } \\ \sf \scriptsize{Now,Power, P= V×I \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

$\sf\scriptsize{So,100×x = 220 × 5} \\ \sf \scriptsize{x = \frac{220 \times 5}{110} } \\ \sf \scriptsize{x = 11}$

$\sf \scriptsize{Thus , \: a \: maximum \: number \: of \: 11 \: bulbs \: can \: be \: used.}$

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