How many 60 W lamps may be safely run on a 230 V circuit fitted with a 5 A fuse?

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Solution

The correct option is B 19
Using $P = V I$ , the current through each bulb is $I = P / V = 60 / 230 = (6 / 23) A$

If n lamps are used in parallel, so total current , $n I \leq 5$

or $n (6 / 23) \leq 5$
or $n \leq 19.1 o r n = 19$

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How many 60 W lamps may be safely run on a 230 V circuit fitted with a 5 A fuse?

The correct option is B 19Using P=VI, the current through each bulb is I=P/V=60/230=(6/23)AIf n lamps are used in parallel, so total current , nI≤5or n(6/23)≤5 or n≤19.1orn=19

The correct option is B 19
Using $P = V I$ , the current through each bulb is $I = P / V = 60 / 230 = (6 / 23) A$

If n lamps are used in parallel, so total current , $n I \leq 5$

or $n (6 / 23) \leq 5$
or $n \leq 19.1 o r n = 19$