what type of coupling is this? Unplug the 120 VAC assembly and set it aside. Lea

Question

what type of coupling is this?

Unplug the 120 VAC assembly and set it aside. Leave the small gauge wire connected to the scope probe as described earlier, but now cut it into 2 pieces of equal length. Strip a short piece of insulation from each of the 2 new ends. Place one of these wire ends between your fingers and note the response on the oscilloscope, then touch the end of the other wire and again note the response. Now leave the ends of the wires open and move the wires around. Note the response on the oscilloscope as the wires are moved around. As a final test, plug in the 120 VAC test assembly (with no load connected), move each of the small gauge wires near the black wire, and observe the responses.

this is my lab. what type of coupling is this? Be sure to provide some reasonable level of detail

Explanation / Answer

For most parts of electronics is concerned,there are two types of coupling in any alternating current source (AC) circuits: 1)capacitive coupling(Also known as the AC coupling) 2)Inductive Coupling(Also known as the Transformer coupling) Two circuits of different amplification factors and different hybrid parameter values can be merged or coupled by means of a capacitor (capacitive coupling) or an inductor or a transformer (inductive coupling).There are coupling coefficients involved with the transformer.But Capacitor blocks DC and allows AC most of the time.We use ceramic capacitors for this purpose.However never replace the ceramic capacitor with an electrolytic capacitor .Electrolytic capacitors are strictly polar while ceramic capacitors are not.Electrolytic capacitors are used as bypass capacitors.They bypass the current from the resistances that are parallel to them during high frequencies.This is so because the reactance of the capacitor is low at such high frequencies.Also current takes the least resistance path.As reactance gives the AC equivalent of the resistance,current flows into the capacitor while resistance and capacitors are connected end-end and thus the current reaches the other node(its like a diversion or a detour or a shortcut on the road for vehicles-analogously it is the simplest path a current can follow on the conductor

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