Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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The electromotive force from a battery drives a current around the circuit shown in the figure. Measurements indicate that 6250 µC of
charge pass point A in 10.0 s.
A
Device
(a) What is the current in the circuit? i
(b) How many electrons pass point A per second? i
(c) What direction are the electrons flowing around the circuit?
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x 10-4 A
x 1015 electrons/s
clockwise
counterclockwise
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Lightning is a spectacular example of electric current in a natural phenomenon. There is much variability to lightning bolts, but a typical event can transfer 10^9 J of energy across a potential difference of perhaps 5 x 10^7 V during a time interval of about 0.2 s. Use this information to estimate
(a) the total amount of charge transferred between cloud and ground
(b) the current in the lightning bolt
(c) the average power delivered over the 0.2 s.
Three wires meet at a junction. Wire 1 has a current of 0.40 A into the junction. The current of wire 2 is 0.65 A out of the junction. (a) How many electrons per second move past a point in wire 3? (b) In which direction do the electrons move—into or out of the junction?
Chapter 25 Solutions
Physics for Scientists and Engineers
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- Suppose that there is a wire. It is made out of material that has a the following information: temperature coefficient = 0.005/°C cross sectional area = 4.51x10-6 m² length: 1.00 m free electron density = 8.49 x 1028 electrons/m³ The wire is at temperature 20°C and it carries a current of 5 A when connected to a 35 V battery. Find the (1) drift speed of the electrons and (2) resistivity at 50°C.arrow_forwardTwo copper wires with different diameters are joined end to end. If a current flow in the wire combination, what happens to electrons when they move from the larger-diameter wire into the smaller-diameter wire? Does their drift speed increase, decrease or stay the same?arrow_forwardA 60 W lightbulb typically has a current of 0.50 A flowing through it. Calculate (a) the number of electrons passing a cross section of the bulb’s filament each second and (b) the number that pass the section in 1 h.arrow_forward
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