Question

(b) A domestic circuit has 5A fuse. How many bulbs of rating 100W, 220V can be safely used in this circuit? Justify your answer.

Answer 1

Answer:

Current: 5 A

Voltage = 220 V

Power = 100 W

P = V*I

I = P/V

= 100/220 = 5/11

Current in 1 bulb = 5/11 A

Number of bulbs = x

current in 1 bulb * number of bulbs = 5 ampere

5/11 * x = 5

x=11 bulbs

Explanation:

P = V*I

Answer 2

Answer:

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