Question

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

Answer 1

Explanation:

1. if a domestic electric circuit has fuse of 5A
2. Thats means It can afford many electrical appliances whose sum of current is equal to 5A
3. To Find the maximum number of bulb rating of 100 W (220V )
4. Firstly we have to find the current used by 1 bulb
5. So, Power = Potential Difference × Current

100 = 220 × Current

Current = 100/220

Current = 0.45 ampere

Since Maximum Number of Bulbs used are

11 because 0.45 × 11 = 4.95 Ampere

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