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 0.850 m of 12-gauge copper wire carrying 20.0 A. W (b) Repeat the calculation for a 12-gauge aluminum wire. W (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 0.850 m of 12-gauge copper wire carrying 20.0 A. W (b) Repeat the calculation for a 12-gauge aluminum wire. W (c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 61P

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In the United States, the National ElectricCode sets standards for maximum safe currents in insulated copperwires of various diameters. The accompanying table gives a portionof the code. Notice that wire diameters are identified by the gauge ofthe wire, and that 1 mil = 10-3in. Find the maximum power dissipated per length in (a) an 8-gauge wire and (b) a 10-gauge wire.Gauge Diameter (mils) Safe current (A)8 129 3510 102 25
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. (a) Calculate the rate at which internalenergy is produced in 1.00 m of 12-gauge copper wire carrying 20.0 A. (b) What If? 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.
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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 1.40 m of 12-gauge copper wire carrying 20.0 A. W(b) Repeat the calculation for a 12-gauge aluminum wire. W(c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.
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Calculate the drift velocity of electrons when a current of 1.5 A flows in a copper wire of crosssectional area of 5.0 mm2. The electron density in copper is 9.0 x 1028 m-3.(e = 1.6 x 10-19 C)
What current flows through a 2.54-cm-diameter rod of pure silicon that is 20.0 cm long, when 1.00 × 103 V is applied to it? (Such a rod may be used to make nuclear- particle detectors, for example.)