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How do I calculate impedance in a four wire test. i.e. I am passing a 1 amp (A.C.) current through 2 x 10 ohm resistors. One of the resistors is connected in paralel with a switch. When the switch is closed it shorts the resistor causing a voltage drop accros this resistor. The switch can be coated with certain contaminants and it is the impedance of these contaminats I am trying to measure. I measure the voltage accross the two resistors and the current phaze difference between them. How can I use this data to calculate the impedance of the contaminant?

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Hi,

Electrical impedance, or simply impedance, describes a measure of opposition to alternating current (AC). Electrical impedance extends the concept of resistance to AC circuits, describing not only the relative amplitudes of the voltage and current, but also the relative phases. When the circuit is driven with direct current (DC) there is no distinction between impedance and resistance; the latter can be thought of as impedance with zero phase angle.

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