Question

How can you calculate electric impedance?

Answer 1

It depends on what you are given.

If you are given a series circuit with, a resistance, `R`, an inductance, `L`, a capacitance, `C`, and a frequency `f` then the impedance is:

`Z = R+j(2pifL-1/(2pifC))`

NOTE: we use `j = sqrt(-1)` instead of `i = sqrt(-1)` to avoid confusion with i representing current.

If you are given a voltage `v(t) = Ve^(j(omegat+phi)` and a current `i(t) = Ie^(j(omegat+psi)`, then the impedance is:

`Z = V/Ie^(j(phi-psi))`