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A particular hair dryer is designed to operate in the United States, where electrical outlet voltage...

A particular hair dryer is designed to operate in the United States, where electrical outlet voltage is 120V, and its power rating is 1800W. If the heating filament is made of 12-gauge copper wire, which has a diameter of 2.05mm, how long must the filament be? Note that the resistivity of copper is 1.68×10−8Ωm.

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power emitted by thereistor=P P=-=1800W :(V=120V) R =>R=8.00 Resistance of a copper wireof length L and area of Cross section

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