A) 50 W
B) 75 W
C) 100 W
D) 25 W
Correct Answer: D
Solution :
From Joules law, the power consumed is \[P=\frac{{{V}^{2}}}{R}\] \[\Rightarrow \] \[R=\frac{{{V}^{2}}}{P}\] \[\therefore \] \[P=\frac{V{{}^{2}}}{R}=\frac{V{{}^{2}}}{{{V}^{2}}}\times P\] Given \[V=110\,volt,\] \[V=220\,volt,\] \[P=110\,\,W\] \[\therefore \] \[P={{\left( \frac{110}{220} \right)}^{2}}\times 100=25\,W\]
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