**Tutorial 11 - Extension**

Proof of the equation

We know that by Ohms Law:

*V*_{R} = *IR*; *V*_{L}
= *IX*_{L}; *V*_{C} = *IX*_{C}; and *V
=IZ*.

So we can substitute to give:

Therefore:

The *I*^{2} terms cancel to give:

Back to Tutorial 11 A

Derive an equation for frequency for series resonance