power factor of L R circuit is
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The variation of impedance (ZZ) in any RLRLcircuit is shown below. The inductive reactance (XLXL) may vary either through a change in L or change in frequency as XL=2πfL=ωLXL=2πfL=ωL


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The time required for the current flowing in the LR series circuit to reach its maximum steady state value is equivalent to about 5 time constants or 5τ. This time constant τ, is measured by τ = L/R, in seconds, where R is the value of the resistor in ohms and L is the value of the inductor in Henries.
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