A) 2 \[\Omega \]
B) 8 \[\Omega \]
C) 12 \[\Omega \]
D) 16 \[\Omega \]
Correct Answer: C
Solution :
Input power \[=VI=200\times 10\] \[=2000\text{ }W,\] Output power \[=\frac{40}{100}\times 2000\] \[=800W\] Power loss in heating the armature \[=2000-800\] \[=1200W\] \[\therefore \] \[{{I}^{2}}R=1200\] or \[R=\frac{1200}{{{I}^{2}}}\] \[=\frac{1200}{10\times 10}\] or \[R=12\Omega \]You need to login to perform this action.
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