Review 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. ΑΣφ V V

Review 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. ΑΣφ V V

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 37P: Residential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for...

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When does an incandescent lightbulb carry more current? (a) immediately after it is turned on and the glow of the metal filament is increasing or (b) after it has been on for a few milliseconds and the glow is steady?
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 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 rectangular block of copper has sides of length 10. cm, 20. cm,and 40. cm. If the block is connected to a 6.0 - V source acrosstwo of its opposite faces, what are (a) the maximum currentand (b) the minimum current the block can carry?
An engineer wishes to replace a 2.00 m wire with a 35.0 cm wire and use a 11.0 V supply instead of 34.0 V supply. In order to ensure the same resistive power from the new shorter wire operating with less voltage, what fractional change in a) resistivty, b) or radius would be necessary? I know the answers for part a) is 0.598 and part b) is 1.29 but how would I get that? Please help!!
A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipatedinside the battery? (c) At what rate (in ºC/min ) will itstemperature increase if its mass is 20.0 kg and it has aspecific heat of 0.300 kcal/kg ⋅ ºC , assuming no heatescapes?
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.)
Batteries are rated in terms of ampere - hours (A ⋅ h). For example,a battery that can deliver a current of 3.0 A for 5.0 h is ratedat 15 A ? h. (a) What is the total energy, in kilowatt - hours, storedin a 12 - V battery rated at 55 A ⋅ h? (b) At $0.12 per kilowatthour,what is the value of the electricity that can be producedby this battery?
Why is the current in an incandescent bulb greater immediately after it is turned on than it is a few moments later? (That’s why bulbs usually burn out just as they are being turned on.)
A copper wire has a circular cross-section with a radius of1.25 mm. (a) If the wire carries a current of 3.70 A, findthe drift speed of electrons in the wire. (Take the density ofmobile charge carriers in copper to be n= 1.10 x 1029 electrons/m3.) (b) For the same wire size and current, find thedrift speed of electrons if the wire is made of aluminum withn= 2.11 x 1029 electrons/m3.
A 14-gauge copper wire has a diameter of 1.628 mm. What magnitude current flows when the drift velocity is 1.00 mm/s? (See below example for useful information.) Calculate the drift velocity of electrons in a 12-gauge copper wire (which has a diameter of 2.053 mm) carrying a 20.0-A current, given that there is one free electron per copper atom. (Household wiring often contains 12-gauge copper wire, and the maximum current allowed in such wire is usually 20 A.) The density of copper is 8.80 x 103 kg/m3 .
The current in a certain wire at 20.0°C is 2.40 A when thepotential difference between the ends of the wire is 1.50 V. Ifthe wire is heated to 80.0°C and the potential differenceremains the same, the current decreases to 2.00 A. (a) What isthe resistance of the wire at 20.0°C? At 80.0°C? (b) What is thetemperature coefficient of resistivity for the material of whichthis wire is made?
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