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Free Ground Loops in Audio & Video Systems Essay Sample

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One common myth that has been discussed in the introduction is that of this article is that cables do "pick" noise from the air or from its external environment (Whitlock, 2005). This myth therefore insinuates that insulation can be used to prevent the cable from picking up more noise from its surrounding. It very important to understand this myth as many of those who design and install audio/video systems wrongly presumes that grounding and interfacing is not an important part for preventing interference. Instead, they concentrate in preventing an imaginary interference from the internal signal.


In most cases, ac lines are insulated to prevent any accidental leaks of voltage. Some accidental exposures to the ac line power devices can lead to electrocution for anyone who gets in touch with it. This can happen despite the fact that ac wires are insulated.  To mitigate such possible disasters, a third wire is normally used for grounding purposes. Commonly known as neutral wire, it is connected to the safety ground pin to give way for any direct power leaks to the earth.

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The common problem is the assumption that wires have no resistance within themselves. For example, when using a wire to transmit voltages, it's important to take into consideration the fact that its length, bends and loops will affect the transmitted voltage. The author states that there is normally wrong assumption that diameter of the wire have no great impact related to resistance (Whitlock, 2005). I have always believed that diameter of a wire has a greater impact on the voltage being transmitted than the length. This assumption has been grounded on simple experiments such as using thicker wires to transmit hire voltage and thinner ones for lower voltages.

This information is useful since it is giving a greater insight into attempts to use certain equipments and approaches to insulate noise problems. It is also offering alternative to noise elimination, paving ways for more research.

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