Wrapping Cables

Why are A/V cables wrapped over/under and power cables wrapped over/over? Why is this an important skill for a beginning filmmaker?

A/V cables are wrapped over/under because this technique follows the natural coil of the the cable. Without proper wrapping technique, the lifespan of the cable can be shortened because the cable will eventually twist inside. A failing audio cable is especially problematic to a beginning filmmaker because they often do not have the budget to replace these cables. Thus, allowing the cable to have its maximum lifespan is vital to a beginning filmmaker. Being able to properly wrap a cable is also important when contributing to a production especially if one is working as a PA.