Essential University Physics
4th Edition
ISBN: 9780134988566
Author: Wolfson, Richard
Publisher: Pearson Education,
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 24, Problem 14E
The National Electrical Code specifies a maximum current of 10 A in 16-gauge (1.29-mm-diameter) copper wire. What’s the corresponding current density?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
1. a) Find the electrical resistance of a 0.5 cm long, 22-gauge silver wire, if the electrical
conductivity of silver is 6.15 x 107 (0-m)-¹ at 20° C. The diameter of 22-gauge wire is 0.6438
mm at this temperature.
b) If a potential difference of 10.0 µV is established across the wire, find the current and
current density in the wire. Current density is given by J = 1/A, where A is the cross-sectional
area of the wire.
c) Find the magnitude of the electric field in the sample, assuming it is constant.
The National Electric Code specifies a maximum current of 10 A in 16 gauge copper
wire (1.29 mm diameter). What is the corresponding current density?
An 18 gauge copper wire (diameter 1.02 mm) carries a current with a current density of 3.20 * 106 A/m2. The density of free electrons for copper is 8.5 * 1028 electrons per cubic meter. Calculate (a) the current in the wire and (b) the magnitude of the drift velocity of electrons in the wire.
Chapter 24 Solutions
Essential University Physics
Ch. 24.1 - Prob. 24.1GICh. 24.2 - Two wires carry the same current I. Wire A has a...Ch. 24.3 - Prob. 24.3GICh. 24.4 - You put a variable resistance across a battery...Ch. 24.5 - Todays power tools are often cordless, powered by...Ch. 24 - Explain the difference between current and current...Ch. 24 - A constant electric field generally produces a...Ch. 24 - Good conductors of electricity are often good...Ch. 24 - Does an electric stove burner draw more current...Ch. 24 - A person and a cow are standing in a field when...
Ch. 24 - You put a 1.5-V battery across a piece of...Ch. 24 - Prob. 7FTDCh. 24 - A 50-W and a 100-W lightbulb are both designed to...Ch. 24 - Equation 24.8a suggests that no power can be...Ch. 24 - Whats wrong with this news report: A power-line...Ch. 24 - A wire carries 1.5 A. How many electrons pass...Ch. 24 - A 12-V car battery is rated at 80 ampere-hours,...Ch. 24 - Biologists measure the total current due to...Ch. 24 - The National Electrical Code specifies a maximum...Ch. 24 - The electric field in an aluminum wire is 85 mV/m....Ch. 24 - What electric field is necessary to drive a 7.5-A...Ch. 24 - Prob. 17ECh. 24 - A 1.0-cm-diameter rod carries a 50-A current when...Ch. 24 - Use Table 24.1 to determine the conductivity of...Ch. 24 - Find the resistance of a heating coil that draws...Ch. 24 - Prob. 21ECh. 24 - Whats the current in a 47-k resistor with 110 V...Ch. 24 - The third rail that carries electric power to a...Ch. 24 - What current flows when a 45-V potential...Ch. 24 - A uniform wire of resistance R is stretched until...Ch. 24 - A cars starter motor draws 125 A with 11 V across...Ch. 24 - A 4.5-W flashlight bulb draws 750 mA. (a) At what...Ch. 24 - A watch uses energy at the rate of 240 W. What...Ch. 24 - A 35- electric stove burner consumes 1.5 kW of...Ch. 24 - An incandescent lightbulb draws 625 mA, while an...Ch. 24 - Though rare, electrocution has been reported under...Ch. 24 - You touch a defective appliance while standing on...Ch. 24 - You have a typical resistance of 100 k. (a) How...Ch. 24 - Example 24.3: Modern houses are often equipped...Ch. 24 - Example 24.3: The maximum current rating for...Ch. 24 - Prob. 36ECh. 24 - Example 24.3: The solar corona is the Sun’s hot...Ch. 24 - Prob. 38ECh. 24 - Example 24.4: A potential difference of 233 mV is...Ch. 24 - Example 24.4: Find the length of the electrolyzer...Ch. 24 - Example 24.4: Magnetic effects involving Jupiter’s...Ch. 24 - An ion channel in a cell membrane carries 2.4 pA...Ch. 24 - A lightbulb filament has diameter 0.050 mm and...Ch. 24 - A gold film in an integrated circuit measures 1.85...Ch. 24 - A copper wire joins an aluminum wire whose...Ch. 24 - Prob. 46PCh. 24 - In a study of proteins mediating cell membrane...Ch. 24 - The single most important use of the element gold...Ch. 24 - The maximum safe current in 12-gauge...Ch. 24 - Silver and iron wires of the same length and...Ch. 24 - You have a cylindrical piece of material 2.4 cm...Ch. 24 - How must the diameters of copper and aluminum wire...Ch. 24 - Youre writing the instruction manual for a power...Ch. 24 - An implanted pacemaker supplies the heart with 72...Ch. 24 - A rectangular pad made of gold is used as a...Ch. 24 - Each pulse produced by the Taser described in the...Ch. 24 - The Nissan Leaf is an all-electric car powered by...Ch. 24 - An electric heater is tested by immersing it in...Ch. 24 - (a) Determine the power associated with the...Ch. 24 - At a particular point in a material with...Ch. 24 - A thermally insulated container of seawater...Ch. 24 - Youre heading out for spring break, but your car...Ch. 24 - Two cylindrical resistors are made from the same...Ch. 24 - Youre working on a new high-speed rail system. It...Ch. 24 - A 100%-efficicnt electric motor is lifting a 15-N...Ch. 24 - A power plant produces 1000 MW to supply a city 40...Ch. 24 - Prob. 67PCh. 24 - A 240-V electric motor is 90% efficient, meaning...Ch. 24 - A metal bar has rectangular cross section 5.0 cm...Ch. 24 - An immersion-type heating coil is connected to a...Ch. 24 - Prob. 71PCh. 24 - The current density in a particle beam with...Ch. 24 - You work for an automobile manufacturer developing...Ch. 24 - During the brownout, the current in conductors...Ch. 24 - Which of the following occurs in the conductors of...Ch. 24 - During the brownout, the power dissipated in...Ch. 24 - Prob. 77PP
Additional Science Textbook Solutions
Find more solutions based on key concepts
14. 25 kg = _________ g
Applied Physics (11th Edition)
Point charges q1=q2=4.0106C are fixed on the x-axis at x=3.0 m and x=3.0 m. What charge q must be placed at the...
University Physics Volume 2
Look up the enthalpy of formation of atomic hydrogen in the back of this book. This is the enthalpy change when...
An Introduction to Thermal Physics
At the right is a sketch showing one of the atoms in the diffuse, cool cloud of gas described in the previous q...
Lecture- Tutorials for Introductory Astronomy
24. (II) A geologist finds that a Moon rock whose mass is 9.28 kg has an apparent mass of 6.18 kg when submerge...
Physics: Principles with Applications
What is the role of “loose” electrons in heat conductors?
Conceptual Physics (12th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- An 18 gauge copper wire (diameter 1.02 mm) carries a current with a current density of 2.90×10^6 A/m2. The density of free electrons for copper is 8.5×10^28 electrons per cubic meter. Calculate the current in the wire. Express your answer with the appropriate units. Calculate the magnitude of the drift velocity of electrons in the wire. Express your answer with the appropriate units.arrow_forwardAn 18-gauge copper wire with a diameter of 3-mm carries a constant current of 1.2-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. Determine the current density in kA/m2.arrow_forwardThe current density in a copper wire of diameter 1.02 mm is 1.75x105 A/m2. The number of free electrons per cubic meter of copper is 8.5x1028. Find the (a) current in the wire and (b) magnitude of drift velocity of electrons in the wire.arrow_forward
- A current of 5.00 A runs through a 12-gauge copper wire (diameter 2.05 mm) and through a light bulb. Copper has 8.5 x 1028 free electrons per cubic meter. (a) What is the total charge in the light bulb per second? (b) What is the current density in the wire? qe = 1.6x10-19 C Select one: (a) Q = 0.2 C, (b) J = 0.01 x 10° A/m? (a) Q = 12 C, (b) J = 23.4 x 106 A/m (a) Q = 5.0 C, (b) J = 121 x 106 A/m² (a) Q = 10 C, (b) J = 121 x 10 A/m? (a) Q = 8.0 C, (b) J = 1.51 x 10° A/m² (a) Q = 5.0 C, (b) = 1.51 x 10° A/m? None of these is correctarrow_forwardAn aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps. (a) What is the absolute value of the charge density in the wire? (b) What is the drift velocity of the electrons? (c) What would be the drift velocity if the same gauge copper were used instead of aluminum? The density of copper is 8.96 g/cm3 and the density of aluminum is 2.70 g/cm3 . The molar mass of aluminum is 26.98 g/mol and the molar mass of copper is 63.5 g/mol. Assume each atom of metal contributes one free electron.arrow_forwardA hollow copper wire with an inner diameter of 0.70 mm and an outer diameter of 2.4 mm carries a current of 13 .What is the current density in the wire?arrow_forward
- ostro Imssb1.mutah.edu.jo/r A conductor has a cross-sectional area of 2.3x 10-6 m2 and the number of free electrons per unit volume is 8.5x 1028 electron/m. When the current is 9 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10-19 Carrow_forwardA fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 440 A/cm?. What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.50 A?arrow_forwardQuestion 5... A current of 3.70 A is carried by a 250 m long copper wire of radius 1.25 mm. Assume an electronic density of 8.47 x 1028 m-3, resistivity p = 1.67 x 10-$n · m, and resistivity temperature coefficient of a = 4.05 x 10-3 °C-1 at 20 °C. .8 (a) Calculate the drift speed of the cloctrons in the copper wire. (b) Calculate the resistance of the at 35°C. (c) Calculate the difference of potential between the two ends of the copper wire.arrow_forward
- A 0.68-mm-diameter copper wire carries a tiny current of 2.5 μA. The molar mass of copper is 63.5 g/mole and its density is 8900 kg/m^3. NA=6.02×10^23 Estimate the electron drift velocity. Assume one free electron per atom. Express your answer to two significant figures and include the appropriate units. vd=arrow_forwardThe current of an electron beam has a measured current of I=39.2 μA with a radius of 1.74 mm. What is the magnitude of the current density of the beam? Include units in your answer.arrow_forwardA 15m long copper wire has a cross-sectional radius of 3mm. (a) What is the resistance of the wire? (b) If 200mA of current flows through the wire, what is the voltage drop of the wire at 20°C? (c) What is the voltage drop per meter at 20°Carrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Ohm's law Explained; Author: ALL ABOUT ELECTRONICS;https://www.youtube.com/watch?v=PV8CMZZKrB4;License: Standard YouTube License, CC-BY