(7.1118 is close, but not within the allowed error tolerance) What is the potent

Question

(7.1118 is close, but not within the allowed error tolerance)

What is the potential difference across one wire of a 90 m extension cord made of 16 gauge copper wire carrying a current of 6 A at room temperature (20 degree C )? (7.1118 is close, but not within the allowed error tolerance) According to Table 25-2 of your textbook, the cross sectional area of a gauge 16 copper cable is 1.309 mm2 and, according to Table 25-1 on the same page, its resistivity is 1.7 Times 10-8 ohms m at the standard room 20 degree C

Explanation / Answer

Resistance R = rho L/A = 1.7*10^-8 * 90/1.309*10^-4 = 1.16883 ohms

as V = iR

V = 6* 1.16883 = 7.0129 volts

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