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Презентация была опубликована год назад пользователемПолина Айдарова

1 FARADAYs Law of Induction. Motional EMF. Generation of Electric Power.

2 Plan. 1.Faradays Law of Induction. 2.Lentzs Rule. 3.Motional EMF. 4.Commercial generation of electric power. 5.Self-induction (Inductance) L.

3 SERWAY, Chapter (pp. 967 – 1032). RECOMMENDED LITERATURE to the TOPIC Magnetic induction & self-induction: HALLIDAY, RESNICK, WALKER Chapter (pp ).

4 1. FARADAYs LAW of INDUCTION: E =–dФ/dt where Ф=(BS) scalar (magnetic flux) 1 Weber (Wb)=Tesla m 2

5 FARADAYs LAW of INDUCTION (continued): E =–dФ/dt where E is E.M.F., [ E ] = Volts (V), [Ф] = Weber (Wb), [t] = sec.

6 EMF induced in a circuit is directly proportional to the time rate of change of magnetic flux through the circuit. FARADAYs LAW of INDUCTION (formulation):

8 FLUX LINKAGE (Magnetic Linkage): N E =–d /dt where N is number of turns in a coil, [Ф]=[ ]= Weber (Wb)

9 Faraday-Maxwell Law (differential form, SI): rot E = –B/t

10 2. Lentzs Rule (formulation): Magnetic action of induced electric current tends to counteract (resist) the reason that generates such induced current.

11 Lentzs Rule (diagram)

13 Setup of one of FARADAYs Experiments

14 3. Motional EMF – – EMF induced in a conductor moving through a constant magnetic field.

15 Motional EMF (continued)

16 Here, the MAGNETIC FLUX will be changing when BCD moving:

17 4. Commercial generation of electric power

18 Commercial generation of AC (continued)

19 5. Self-Induction (Inductance) L E = - L d I / d t SI unit for inductance L: Henry (H)=V s /A

20 remember one of Faradays setups: To explain the phenomenon of self-induction, imagine that 1 ry coil is also 2 ry coil!

21 Self-Induction (Inductance) L Applications: AC circuits, electronics (LC, LR)

22 Current Rating THE UNIVERSITY OF DODOMA TUTORIALSTEST TUTO -TESTSUM LIST OF STUDENTS(PH121) DATES PAPER 1 RIAL SPAPER2 S/ NN A M E 24.мар05.апр 12.ап р19.апр April 28th L030 5May 3rd in May June 2nd Pts: 1 SHIJA PAUL 2 -0,52 9,7 13,2 2 RABACH OUMA R ,5 12,5 3 RAPHAEL PASCHAL ,5 12,5 4 CHACHA MARWA 1 210,3 12,3 5 HOROMA FIDEL 11 18,1 11,1

23 6 BADOKUFA PROSPER H SALIM MWANAIDI 2 -0,5 9 10,5 8 CHALLO BONIFACE S. 0 9,9 9 GHATI CHARLES 10 8,6 9,6 10 MAFTAHA MGENI M MWENDI CARITAS D. 0 0,58, ABEL BONIVENTURE 1 7,7 8,7 Current Rating (continued)

24 13 FELIX FESTUS 9,7 8,7 14 MTERA ELIREHEMIA Z. 0 8,5 15 MDEMU SELEMAN M. 0 8,5 16 JAJI KIZITO 0 8,4 17 HALFANI OMARI 9,3 8,3 18 LIWAHA ERNEST H. 0 8,3 19 IKELYA NYANDA 2 6,7 7,7

25 Current Rating (continued) 20 HINJU NATHANIEL A. 0 0,57,1 7,6 21 JUMA JUMA M. -0,5 8,1 7,6 22 MICHAEL THOMAS W. 8,5 7,5 23 BAKARI BONIFACE J. 0 7,1 24 WYCLIFE OTENYO 0 6,7 25 MWENYEMBEGU AGREY R. 7,1 6,1 26 SAIDI JUMA 0 6,1

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