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

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 N S e

ELECTRON FLOW DIRECTION 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