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How does the sign of the phase angle phi, by which the supply voltage leads the current in an LCR series circuit, change as the supply frequency is gradually increased from very low to very high values. |
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Answer» Solution :The phase angle `phi` by which VOLTAGE leads the current in L-C-R series circuit is given by, `tan phi=(X_L-X_C)/R=(2pivL-1/(2pivC))/R` `therefore` for `V lt v_r "tan" phi lt 0` and where v=frequency for `v GT v_r tan phi gt 0 v_r`= resonant frequency for `v=v_r tan phi=0` |
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