Transcript Electromagnetism

ELECTROMAGNETISM
ELECTROMAGNETISM
?????
ELECTROMAGNETISM
THE BRANCH OF PHYSICS THAT DEALS
WITH THE RELATIONSHIP BETWEEN
ELECTRICITY & MAGNETISM
MAGNETIC PHENOMENON
ELECTROMAGNETISM
DAVY’S EXPERIMENT
OERSTED’S EXPERIMENT

ANY CHARGE IN MOTION
CREATES MAGNETIC FIELD
MOVING ELECTRONS
INDUCE MAGNETIC FIELD
DETERMINING THE
DIRECTION OF THE
MAGNETIC FIELD AROUND
CURRENT CARRYING
CONDUCTOR

THUMB-DIRECTION OF ELECTRONS
FLOW
 FINGERS—MAGNETIC FLUX LINES
COIL OF WIRE IS CALLED
HELIX
COIL OF WIRE CARRYING
ELECTRICAL CURRENT IS
CALLED SOLENOID
SOLENOID’S MAGNETIC
FIELD
ELECTROMAGNET=
SOLENOID + IRON CORE
ELECTROMAGNET
ELECTROMAGNET vs SOLENOID
ELECTROMAGNET
SOLENOID
ELECTROMAGNETIC
INDUCTION:
AN ELECTRIC CURRENT IS INDUCED IN
IN A CIRCUIT IF SOME PART OF THIS
CIRCUIT IS IN A CHANGING MAGNETIC
FIELD
E.M. INDUCTION

STATIONARY CONDUCTOR + MOVING
MAGNET
 STATIONARY MAGNET + MOVING
CONDUCTOR
 ELECTROMAGNET WITH A/C
CURRENT + STATIONARY
CONDUCTOR
STATIONARY MAGNET
MOVING MAGNET
MOVING MAGNET
ELECTROMAGNET WITH
A/C
METAL DETECTOR
FARADAY’S LAW
MAGNITUDE OF INDUCED CURRENT
DEPENDS ON

THE STRENGTH OF MAG. FIELD
 THE VELOCITY OF MAG. FIELD
 THE ANGLE OF THE CONDUCTOR TO THE
MAG. FIELD
 THE NUMBER OF TURNS IN THE
CONDUCTOR
SPEED
FAST –E.M.F
ANGLE
ANGLE –E.M.
# OF COILS
STRONGER
WEAKER
LEFT HAND DYNAMO RULE
S
N
e
ELECTRON FLOW
DIRECTION
DIRECTION OF e
DIRECTION OF e
ELECTRIC GENERATOR
( DYNAMO)—A DEVICE
THAT CONVERTS
MECHANICAL ENERGY TO
ELECTRICAL ENERGY BY
E.M. INDUCTION
GENERATOR
COMPONENTS

A POWERFUL MAGNET
 AN ARMATURE (WIRE LOOP)
GENERATORS

D/C
 A/C
D/C GENERATOR
COMMUTATOR RING
D/C POWER FROM
BATTERY
I
TIME
A/C GENERATOR
A/C FREQUENCY IN THE US – 60 Hz
ELECTRIC MOTOR-A
DEVICE THAT CONVERTS
ELECTRICAL ENERGY TO
MECHANICAL ENERGY
TYPES OF MOTORS

D/C ( COMMUTATOR RING!!)
 A/C
D/C MOTOR
A/C MOTORS

SYNCHRONOUS ( REVERSE OF
GENERATOR)

INDUCTION
INDUCTION MOTOR
ROTATES THE ANODE IN
THE MODERN X-RAY TUBES
INDUCTION MOTOR
ROTOR
STATOR
PRINCIPLE OF OPERATION
RIGHT HAND MOTOR RULE
COMPARISON –
GENERATOR vs MOTOR