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Calculate power factor of given LR circuit

Option: 1

0.157


Option: 2

2.34


Option: 3

0.018


Option: 4

0.293


Answers (1)

best_answer

As we learned

Power Factor -

\cos \phi = \frac{R}{\sqrt{R^{2}+X_{L}^{2}}}

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 Power factor, cos\phi =\frac{R}{\sqrt{R^{2}+X_{L}^{2}}}

cos\phi =\frac{R}{\sqrt{R}+(2\pi fL)^{2}}

         =\frac{0.01}{\sqrt{(0.01)^{2}+(2\times 3.14\times 50\times 0.2\times 10^{-3})^{2}}}

         =\frac{0.01}{6.35\times 10^{-2}}

         Cos\phi=0.157

 

Posted by

seema garhwal

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