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In the following circuit, bulb rated as ...

In the following circuit, bulb rated as 1.5 V, 0.45 W. If bulbs glows with full intensity then what will be the equivalent resistance between X and Y-

A

`0.45 Omega`

B

`1 Omega`

C

`3 Omega`

D

`5 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
When bulb glows with full intensity, then voltage across it will be 1.5 V and voltage across `3 Omega` resistance will be- 4.5 V

Current through `3 Omega` resistance ` i = 4.5/3 = 1.3 A`
Same current will flow between X and Y
So, `V_(XY) = iR_(XY) rArr 1.5 R_(XY) rArr R_(XY) = 1 Omega`
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