1. A large spool in an electrician's workshop has 75 m of insulation coated wire coiled around it. When the electrician connects a battery to the ends of the spooled wire, the resulting current is 1.1 A. Some weeks later, after cutting off various lengths of wire for use in repairs, the electrician finds that the spooled wire carries a 2.9-A current when the same battery is connected to it. What is the length of wire remaining on the spool? m

1. A large spool in an electrician's workshop has 75 m of insulation coated wire coiled around it. When the electrician connects a battery to the ends of the spooled wire, the resulting current is 1.1 A. Some weeks later, after cutting off various lengths of wire for use in repairs, the electrician finds that the spooled wire carries a 2.9-A current when the same battery is connected to it. What is the length of wire remaining on the spool? m

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Biomedical Application. The parts of the body that are most sensitive to electric currents are the brain, the chest muscles and the nerve centers that controls respiration and the heart. A current of 1mA passing through the body will barely be noticeable, but a current of 80mA will usually be fatal unless it is immediately stopped. In most situations, the amount of current that will flow into the body will depend on the condition of the skin at contact locations. Dry skin will have a high resistance but damp or wet skin will have low resistance. Why?
The current in a wire varies with time according to the relation I = 55 A - (0.65 A/s²)t². For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Current density and drift velocity in a wire. How many coulombs of charge pass a cross section of the wire in the time interval between t = 0 and t = 8.5 s? Express your answer in coulombs. Q= Submit Part B I = ΑΣΦ Submit Request Answer What constant current would transport the same charge in the same time interval? Express your answer in amperes. ΑΣΦ ? Request Answer ? A
2.A current-carrying gold wire has a diameter 0.84 mm. The electric field in the wire is 0.49 V/m. What are (a) the current carried by the wire (b) the potential difference between two points in the wire 6.4 m apart; (c) the resistance of a 6.4-m length of this wire?
One room of a house has two mats for radiant heating. The mats are wired inparallel. One mat draws 5 amperes of current and the other draws 3 amperes.What is the effective current drawn by the mats in this room?
12. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend -- he was neither stupid nor suicidal. Suppose a kite string of radius 2.00 mm extends directly upward by 0.800 km and has a resistivity 150 N m when wet. If the potential difference between the two ends of the string is 160 MV, what is the current through the wet string? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500,000 A (way beyond just being lethal).
Subject: physics
8 - The figure in the attachment represents a section a circular conductor of nonuniform diameter carrying a current of 6 A. radius of cross section A1 is 0.5 cm. What is the magnitude of the current density across A,? Ag A1 Figure P27.8 a) O 50,64 kA/m? b) O 56,4 kA/m2 c) O 76,4 kA/m2 d) O 76 A/m² O 56,4 A/m?
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A long, cylindrical wire with a length of 1.5 m and a cross-sectional area of 5.0 mm2 carries a steady current of 5.0 A. If the number density of free electron carriers in the wire is 8.0 x 1028 e- ' s/m3, what is the drift velocity of the free electrons that carry the current? a. 6.5 x 10-7 m/s b. 7.8 x 10-7 m/s c. 4.2 x 10-7 m/s d. 9.7 x 10-7 m/s e. 2.1 x 10-6 m/s
QUESTION 16 A lightbulb in a home is emitting light at a rate of 120 watts. If the resistance of the light bulb is 15.0 Q, what is the current passing through the bulb? а. 2.10 A b. 4.43 A С. 2.83 А d. 1.75 A Ое. 3.56A