Why is there 3 of them? What do they each do?
In: Technology
The headphone chord is made up of three different metal wires that conduct the electrical signals. There is one for the left audio channel, one for the right audio channel and a common wire. The audio signal is sent as a voltage difference between the signal wire and the common wire. In order to prevent short circuits between these wires they are coated in a plastic/rubber coating and these are often colored to help distinguish them during assembly. I do not think orange, blue and green is a common standard but it is only used by the assembly plant so it is not important and they probably picked the cheapest colors they could get their hands on. These three wires and then bundled together and another plastic/rubber coating is added to make them into a single durable cable.
i believe they mean the non-conductive actual string. that is used to add some durability to the cord, as the conductive copper cables can get stretched out and break. the string helps keep them from being pulled out of the plug or earphone
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