What you trying to measure? Resistors reflect the state of both current and voltage...at least that is what they said in school. If you are trying to measure an unknown current all you need to know is the resistor value when you plug it in and use ohms law. All this assumes that you can tap into the lines offcourse.
inductor impedince. 1/(2(pi)LF)=xc Do some math and you can rebalance it so that you can get your value of the inductor. A chock is only going to take high noises out. So anything below 60hz might show up. Well actually it might even be a little above 60hz. You should talk to john s or ed.
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