A) 0.45 W
B) 1 W
C) 3 W
D) 5 W
Correct Answer: B
Solution :
When bulb glows with full intensity, then voltage across it will be 1.5 V and voltage across 3 W resistance will be 4.5 V. Current through 3 W resistance \[i=\frac{4.5}{3}=1.5A\] Same current will flow between X and Y So \[{{V}_{XY}}=i{{R}_{XY}}\] Þ \[1.5=1.5{{R}_{XY}}\] Þ \[{{R}_{XY}}=1\Omega \]You need to login to perform this action.
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