How to Calculate the Impedance of a Cable

The American wire gauge of the cable, as well as the frequency, length and voltage, are all part of the calculation and require an oscilloscope, ammeter and a voltmeter to calculate the impedance.

You can make a determination of the relative impedance without all of these factors by using Ohm's Law and knowing the voltage and current.

Things You'll Need

• Voltmeter Ammeter

Instructions

Impedance of a cable

1. Measure the voltage source.

2. Measure the current in the cable.

3. Using Ohm's Law, the impedance Z can be calculated using the formula:

   Z = E / I Where Z is the impedance, E is the Voltage and I is the current.