A) 200 W
B) 300 W
C) 250 W
D) 350 W
Correct Answer: B
Solution :
From Joules law, the heat consumed is \[P=\frac{{{V}^{2}}}{R}\] where V is potential difference, R the resistance. \[\therefore \] \[R=\frac{{{V}^{2}}}{P}\] Given, V = 200 volt, P = 1000 W \[\therefore \] \[R=\frac{{{(200)}^{2}}}{1000}=40\,\Omega \] When using 100 V line, \[P=\frac{{{V}^{2}}}{R}\] \[P=\frac{110\times 110}{40}=302\,W\] \[\therefore \] \[P\approx 300W\]
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