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 thatmuch 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 1.75 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.

Answered: Residential building codes typically…

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A gold wire 4.0 mm in diameter and 1.5 m in length is to be used in a test circuit. (a) Calculate the resistance of the wire. (b) Calculate the current density in the wire when the voltage applied between its ends is 0.070 V. (c) Calculate the electric field in the 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 1.25 m of 12-gauge copper wire carrying a current of 20.0 A. W (b) Repeat the calculation for a 12-gauge aluminum wire. W Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.
A lightning flash during a thunderstorm can consist of one to tens of individual strokes, each with a duration between 10 and 100 milliseconds. Peak currents in a stroke can be as high as 20 kiloamperes. If a specific lightning flash has 10 separate strokes each lasting 50 milliseconds and carrying an average current of 8 kiloamperes, about how much charge gets transferred from the earth to the sky or vice versa? (Hint: the answer provided is 4000 C)
MCQP: 13-17 (page 184)
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.
A 50.0 m long Aluminum wire has a diameter of 0.50 mm and is at 20.0°C. If it carries a current of 0.50 mA, (a) calculate the power delivered to it? (b) If the temperature is increased to 340°C and the potential difference across the wire remains constant, what is the power delivered?
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
Suppose you wish to fabricate a uniform wire from 2.50 g of copper. The wire is to have a resistance of R = 0.360 2 and all the copper is to be used. %3D (a) What must be the length of this wire? (b) What must be the diameter of this wire? pm
(a) A 35.5-m length of copper wire at 20.0°C has a radius of 0.23 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.) Resistivities and Temperature Coefficients of Resistivity for Various Materials (at 20°C) Material Silver A Copper Gold Aluminum Tungsten Iron Platinum Lead Nichrome a Carbon Germanium Silicon Glass Hard rubber Sulfur Quartz (fused) Resistivity (2. m) 1.59 x 107 1.7 x 10-8 2.44 x 10-8 2.82 x 10 5.6 x 107 10.0 x 10 11 x 10 -8 -8 0.46 -8 640 22 x 10-8 3.5 x 107 -8 -8 150 x 10- -8 -5 1010-1014 ≈1013 1015 75 x 1016 Temperature Coefficient of Resistivity [(°C)-¹] 3.8 x 10 -3 3.9 × 10-3 3.4 x 10-3 3.9 x 107 5.0 x 10 4.5 x 10-3 3.92 x 10 -3 -3 0.4 x 107 -3 3.9 × 10-3 -3 -3 -0.5 x 107 -48 x 10-3 -75 x 10-3 aA nickel-chromium alloy commonly used in heating elements. (b) If the wire is heated to 40.0°C while the 7.0-V potential difference is maintained, what is the resulting…
Ch. 26