Download FIGURE 4-1 Magnetic field patterns when magnets are placed end

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Transcript 
FIGURE 4-1
Magnetic field patterns when magnets are placed end to end.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-2
Magnetic flux lines distorted while passing through a piece of iron.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-3
Horseshoe magnet.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-4 Magnetic fields: (a) left-hand rule of magnetic flux; (b) cross section of a conductor with current flow toward the observer;
(c) cross section of a conductor with current flow away from the observer; (d) compass aligns tangent to the circular magnetic lines of
force.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-5
Magnetic field around a loop of wire.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-6 Magnetic field around a coil: (a) coil of wire showing current flow; (b) lines of force around two loops that are parallel; (c)
cross section of a coil showing lines of force.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-7
Electromagnets: (a) pictorial; (b) an electromagnet in operation.[(b) Courtesy of O.S. Walker Co.]
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-7
continued Electromagnets: (a) pictorial; (b) an electromagnet in operation.[(b) Courtesy of O.S. Walker Co.]
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-8
Left-hand rule for finding the polarities of an electromagnet.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-9 Effect of ampere-turns on magnetic field strength: (a) five turns and two amperes = 10 ampere-turns; (b) eight turns and
two amperes = 16 ampere-turns.
(a)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-9 continued Effect of ampere-turns on magnetic field strength: (a) five turns and two amperes = 10 ampere-turns; (b) eight
turns and two amperes = 16 ampere-turns.
(b)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-10 Effect of an iron core on magnetic strength: (a) coil without a core; (b) coil with a core.
(a)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-10 continued Effect of an iron core on magnetic strength: (a) coil without a core; (b) coil with a core.
(b)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-11 Relationship of magnetic and electrical terms.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-12 Domain theory of magnetism: (a) unmagnetized; (b) slightly magnetized; (c) fully magnetized-saturation.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-12 continued Domain theory of magnetism: (a) unmagnetized; (b) slightly magnetized; (c) fully magnetized-saturation.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-12 continued Domain theory of magnetism: (a) unmagnetized; (b) slightly magnetized; (c) fully magnetized-saturation.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-13 Faraday’s law-electrical current is produced when there is relative motion between a conductor and a magnetic field.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-14 Construction and symbols of a relay: (a) pictorial; (b) symbols; (c) illustration. [(a) Courtesy of Airpax Corp., Cambridge
Division.]
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-14 Construction and symbols of a relay: (a) pictorial; (b) symbols; (c) illustration. [(a) Courtesy of Airpax Corp., Cambridge
Division.]
(b)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-14 continued Construction and symbols of a relay: (a) pictorial; (b) symbols; (c) illustration. [(a) Courtesy of Airpax Corp.,
Cambridge Division.]
(c)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-15 Schematic diagram of a relay circuit.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-16 Solenoid devices. [(b) Courtesy of Magnet-Schultz of America, Inc.]
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-16 continued Solenoid devices. [(b) Courtesy of Magnet-Schultz of America, Inc.]
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-17 Magnetic motor contactor. (Courtesy of Furnas Electric Co.)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-18 Magnetic circuit breaker.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-19 Electric bell.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-20 Reed devices: (a) reed relay; (b) reed switch; (c) reed switch as part of a home security system; (d) open and closed reed
switch contacts.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-20 Reed devices: (c) reed switch as part of a home security system.
(c)
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-20 continued Reed devices: (c) reed switch as part of a home security system.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-21 Moving coil meter movement.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-22 Electromagnetic tape recording principle.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-23 Electromagnetic speaker.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-24 Magnetization or B-H curve.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 4-25 Illustration showing the Hall effect.
Dale R. Patrick
Electricity and Electronics: A Survey, 5e
Copyright ©2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458
All rights reserved.
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