Discuss the effects of series resonance.

Explanation

When series resonance occurs, the impedance of the circuit is minimum and is equal to the resistance of the circuit. As a result of this, the current in the circuit becomes maximum. This is shown in the resonance curve drawn between current and frequency.

The maximum current at series resonance is
`Z=sqrt(R^(2)+(X_(L)-X_(C))^(2))=R`
since `X_(L)=X_(C)`
Therefore, the current in the circuit is
`I_(m)=(V_(m))/(sqrt(R^(2)+(X_(L)-X_(C))^(2)))`
`I_(m)=(V_(m))/(R )`
The maximum current at reries resonance is limited by the resistance of the circuit. For smaller resistance, larger current with sharper curve is obtained and vice versa.