Potential difference between an inductor leads the current by 90° in phase while that across a capacitor, it lags in phase by 90°.
![625_lcr circuit.png](https://www.expertsmind.com/../CMSImages/625_lcr circuit.png)
Suppose a phasor diagram current is taken along positive x-direction. Then VR is with respect to positive x-direction, Then VR is related to positive x-direction, VL with respect to positive y-direction and VC along negative y-direction.
![803_lcr circuit1.png](https://www.expertsmind.com/../CMSImages/803_lcr circuit1.png)
So, we can write, V = VR + jVL - jVC = iR + j(iXL) - j(iXC) = iR + j [ i (XL - XC)] = iZ
Here impedence is, Z = R + j(XL - XC) = R + j
The modulus of impedence is, ![2153_lcr circuit4.png](https://www.expertsmind.com/../CMSImages/2153_lcr circuit4.png)
And the potential difference takes the current by an angle,
or
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