A) \[2\,\Omega \]
B) \[8\,\Omega \]
C) \[12\,\Omega \]
D) \[6\,\Omega \]
Correct Answer: C
Solution :
Input power = VI \[=200\times 10\] \[=2000\,W\] Output power\[=\frac{40}{100}\times 2000\] \[=800\,W\] Power loss in heating the armature \[=2000-800\] \[=1200\,W\] \[{{I}^{2}}R=1200\] \[R=\frac{1200}{{{I}^{2}}}\] \[=\frac{1200}{100}\] \[R=12\,\Omega \]You need to login to perform this action.
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