1.

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

Answer»

Solution :Suppose x NUMBER of such bulbs can be used.
Power of one bulb = 100 WATT
Power of x bulbs (P) = 100x watts
Potential difference (V) = 220 volts
I = 5 ampere
We KNOW `P=VI`
`rArr 100x=220x5`
`THEREFORE x=(220xx5)/(100)=11` bulbs


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