A circuit has fuse of 5A. What is the maximum number of 100W(220V) bulb that can be safely used in the circuit?
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Answer:
11 bulbs
Explanation:
working resistance = 220×220/100
= 484
current = 220 / 484 = 0.45Amp
11 bulbs drawing the current 4.95amp (<5 )
12 bulb drawing the current 5.4amp ( >5amp)
So, the number of 100 watts bulbs to connect with out blowing the fuse are 11.
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