For safety reasons, electrical codes have been established that limit the amount of current a wire of a given size can carry. For example, an 18- gauge (cross-sectional area = 1.17 mm²), rubber-insulated extension cord. with copper wires can carry a maximum current of 5.0 A Part A Find the voltage drop in a 14-ft, 18-gauge extension cord carrying a current of 5.0 A. (Note: In an extension cord, the current must flow through two lengths-down and back.) Express your answer using two significant figures. V= Submit ΠΕΙ ΑΣΦ 4 Request Answer → C ? V

A 14-gauge copper wire has a diameter of 1.508 mm. What magnitude current flows in amperes when the drift velocity is 0.500 mm/s? (The density of free electrons in copper is 8.34 x 1028 e /m³.).) A

Question 2. Residential building codes typically require the use of 12-gauge cop- per wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a fire. (a) Calculate the rate at which internal energy is produced in 1.00 m of 12-gauge copper wire carrying 20.0 A. (b) Repeat the calculation for a 12-gauge aluminum wire. (c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.

Residential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a fire. (Table of resistivities) (a) Calculate the rate at which internal energy is produced in 1.15 m of 12-gauge copper wire carrying 20.0 A. _______W (b) Repeat the calculation for a 12-gauge aluminum wire. _______W