1. TOPIC NAME
Pg NO
1.GENERATORS AND MOTORS
3–5
2. LAWS USED IN GENERATORS
AND MOTORS
6
3 .FARADAYS LAW
7–9
4. FLEMINGS LAWS
10 - 14
5. LENZ
LAW
15 - 16
6. AMPERES
LAW
17 - 20
7. MUTUAL AND SELF
INDUCTANCE
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5. 



WHICH CONVERTS MECHANICAL TO ELECTRICAL ENERGY
AND ELECTRICL TO MECH ENERGY
IT IS ELECTRO MECHANICAL CONVERSION DEVICES
FOR A VOLTAGE TO BE INDUCED IN A CONDUCTOR
1. A MAGNETIC FIELD
2. RELATIVE MOTION BETWEEN THE CONDUCTOR AND
THE MAGNETIC FIELD
STATOR OF A DC MACHINE CONSISTS OF
1. YOLK
2. SALIANT FIXED POLES
3. BEARINGS
4. BRUSHES
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6. •
•
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FARADAY’S LAW
FLEMING’S RULES
Lenz law
Ampere’s rules
Mutual and self Induction laws
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7. Faraday,s law states that induced emf
is equal to the rate of change of
magnetic flux in the coil
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9. THEY ARE OF TWO TYPES
1.RIGHT HAND
2.LEFT HAND
FLEMING’S RIGHT HAND
RULE :
It states that when thumb, forefingere and middle Fingere are
streached mutually perpendicular to each other then they
represents motion, field and current respectively

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11. 


Flemings right hand rule used in generator’s
causes:- motion and magnetic field
Effect :- electric current
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12. When current flows in a wire, and an external magnetic
field is applied across that flow, the wire experiences a
force perpendicular both to that field and to the
direction of the current flow. A left hand can be held, as
shown in the illustration, so as to represent three
mutually orthogonal axes on the thumb, first finger and
middle finger. Each finger is then assigned to a quantity
(electric current, magnetic field and mechanical force).
The right and left hand are used for generators and
motors respectively.
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13. Used
for calculation of different
parameters of motors
oThumb - force
oMiddle - flux
oForefingure – current
Causes :-electric current and
magnetic field
Effect :- generates the motion
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15. An
induced electromotive force (emf)
always gives rise to a current whose
magnetic field opposes the original
change in magnetic flux.
Lenz's law is shown with the minus
sign in Faraday's law of
induction, which indicates that the
induced emf and the change in
magnetic flux have opposite signs.
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16. 16

17. This expression is Ampere's Law:
" The integral of B around any closed
mathematical path equals u0 times the
current intercepted by the area spanning
the path "
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21. These
are used in transformers
Mutual- and Self-Induction
The changing magnetic field created by one circuit (the primary) can induce a changing voltage
and/or current in a second circuit (the secondary).
The mutual inductance, M, of two circuits describes the size of the voltage in the secondary
induced by changes in the current of the primary (primary) V(secondary) = - M * ------ : change in
I /change in time
The units of mutual inductance are henry, abbreviated "H".
A circuit can create changing magnetic flux through itself, which can induce an opposing voltage
in itself. The size of that opposing voltage is
V(opposing) = - L * : change in I /change in time
where L is the self-inductance of the circuit, again measured in henries.
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