# Impedance Z caculation

Discussion in 'General Electronics Chat' started by DreamCatch16, Feb 10, 2014.

1. ### DreamCatch16 Thread Starter New Member

Feb 10, 2014
10
0
Hi,

If we have the voltage V = A sin(ωt) and the current I = B sin(ωt+θ)
How to calculate the impedance Z? (Real and imaginary parts)

2. ### shteii01 AAC Fanatic!

Feb 19, 2010
3,963
615
V=I*Z
Z=V/I

You will need to rewrite the sine in order to separate real and imaginary parts.

DreamCatch16 likes this.
3. ### DreamCatch16 Thread Starter New Member

Feb 10, 2014
10
0
OK but how to express V/I as a complex number from where we derive the real and imaginary parts of the impedance

4. ### DreamCatch16 Thread Starter New Member

Feb 10, 2014
10
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Please can any one guide me or give me a reference for how to calculate the impedance using the DFT

Mar 6, 2009
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6. ### DreamCatch16 Thread Starter New Member

Feb 10, 2014
10
0

now is clear that using euler formula we can deduce that the magnitude of |Z|= A / B
and the phase is simply θ which is the pahse differemce between the voltage and the current

for the DFT I want to make samplings of both the current and voltage using a microcontroller and I read that by the DFT I can calculate the impedance but I didn't find a reference where they explain clearly how is it done.