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

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

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

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

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

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

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):

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

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

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

Lentzs Rule (diagram)

Setup of one of FARADAYs Experiments

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

Motional EMF (continued)

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

4. Commercial generation of electric power

Commercial generation of AC (continued)

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

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

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

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

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)

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

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