Review | ConstantsPart AA 8.6x10-4 V/m electric field creates a 2.5x1017 electrons/scurrent in a 1.3-mm-diameter aluminum wire. The density ofmobile electron of aluminium is 6.0 × 1025 /mWhat is the drift speed?Express your answer using two significant figures.> View Available Hint(s)va =m/sSubmitPart BWhat is the mean time between collisions for electrons in this wire?Express your answer using two significant figures.• View Available Hint(s)Hνα ΑΣφ? Part AThe current in a 100 watt lightbulb is 0.810 A . The filament insidethe bulb is 0.300 mm in diameter.What is the current density in the filament?ΠV ΑΣφ?|1.0474168 • 10"A/m²SubmitPrevious Answers Request AnswerX Incorrect; Try Again; 4 attempts remainingPart BWhat is the electron current in the filament?• View Available Hint(s)να ΑΣφ?

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Part A The current in a 100 watt lightbulb is 0.810 A . The filament inside the bulb is 0.300 mm in diameter. What is the current density in the filament? ? |1.0474168 • 10’ A/m² Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B What is the electron current in the filament? • View Available Hint(s) VO AEO

Part A The current in a 100 watt lightbulb is 0.810 A . The filament inside the bulb is 0.300 mm in diameter. What is the current density in the filament? ? |1.0474168 • 10’ A/m² Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B What is the electron current in the filament? • View Available Hint(s) VO AEO

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section17.6: Electrical Energy And Power

Problem 17.7QQ

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Similar questions

A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity , with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: ChargeconductionThermalconductiondqdt=A|dVdx|dQdt=kA|dTdx| In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy flow to the change in temperature.
How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?
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 typical cell phone consumes an average of about 1.00 W of electrical power and operates on 3.80 V. (a) What average current does the phone draw from its battery? (b) Calculate the energy stored in a fully charged battery if the phone requires charging after 5.00 hours of use.
If two different wires having identical cross-sectional areas carry the same current, will the drift velocity be higher or lower in the better conductor? Explain in terms of the equation vd=1nqA by considering how the density of charge carriers n srelates to whether or not a material is a good conductor.
A defibrillator sends approximately 0.1 C of charge through a patients chest in about 2 ms. The average voltage during the discharge is approximately 3,000 V Compute the average current that flows, the average power output, and the total energy consumed (Note: Only a small portion of this current actually flows through the heart in a typical fibrillating procedure. Much of the charge is diffused throughout the patients thoracic cavity).
The batteries of a submerged non-nuclear submarine supply 1000 A at full speed ahead. How long does it take to move Avogadro’s number (6.02 1023) of electrons at this rate?
-gauge copper wire has a diameter of 9.266 mm. Calculate the power loss in a kilometer of such wire when it carries 1.00102 A.
In which of the three semiconducting materials listed in Table 20.1 do impurities supply free charges? (Hint: Examine the range of resistivity for each and determine whether the pure semiconductor has the higher or lower conductivity.)
Integrated Concepts 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 dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg. °C, assuming no heat escapes?
Discuss how the Hall effect could be used to obtain information on free charge density in a conductor. (Hint: Consider how drift velocity and current are related.)
Consider a power plant is located 60 km away from a residential area uses Q-gauge (A=42.40mm2) wire ofcopper to transmit power at a current of I = 100.00 A.How much more power is dissipated in the copper wires than it would be in superconducting wires?