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When does power factor of a series RLC c...

When does power factor of a series RLC circuit become maximum ?

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At resonance, `X_(L)=X_(C)`
`therefore" impedance "z=sqrt(R^(2)+(X_(L)-X_(C))^(2))rArrsqrt(R^(2))=R`
So the circuit becomes purely resistive and have a phase angle. of `0^(@).`
Power factor `=costheta=cos0^(@)=1`
at resonance, the power factor become max.
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