DC Current Electricity
and
Magnetism
in
Electrical Conductors
Electric Field
An Electric Field or Force Surrounding a Charged Particle
An electric field radiates outward from a positiv...
•The movement of Electric Charges is called Current.
• Current is measured by the amount of charge
(Coulombs) passing thro...
Electric Fields Drive Current Electricity
Conventional Current
Assumes Charge Flows from Positive to Negative
CationAnion
Ions contain CHARGES that create
electric fields
+
+
+
+
+
+
+
+ +
+
Current Electricity
Batteries use
electrochemical
rea...
Ions contain CHARGES that create electric fields. These
opposite electric fields produce imbalanced forces necessary
to mo...
A current created by the unidirectional movement of
charge(s) through a conductor is called a direct current.
This current...
When current moves through a conductor a circular
magnetic field is induced around the conductor
Magnetic Field Lines
Nega...
The Right Hand Rule
The direction of the magnetic field
surrounding the conductor can
be found using your
right hand
Posit...
The Direction and Motion of an Induced
Magnetic Field in a Conductor
Current Coming
Towards You
Current Moving
Away From Y...
When current moves through a coiled conductor a
circular magnetic field is induced about the coil
Current and Magnetism in...
Motor (armature) rotation is caused by the simultaneous
attraction and repulsion between the electromagnetic
field in the ...
Induced Magnetic Field
(Due to current)
Fixed Magnetic Field
Force
A Conductor in a Fixed
Magnetic Field
A Current Carryin...
N
S
A Motor Armature in a Fixed
Magnetic Field
The magnetic field surrounding a current
carrying conductor interacts with ...
Fleming's Left Hand (Motor) Rule
Determines the direction of DC current
carrying conductor in a fixed magnetic field
Thumb...
Fleming's Left Hand (Motor) Rule
N
S
Direction of Rotation
Fixed Magnetic Field Direction
Conventional
Current Direction
N
S
N
S Use the Left Hand Rule to
Determine the Rotation
Direction of the Armatures
in A and B
Notice that when the
curren...
Two parallel conductors carrying current
in the same direction will attract each
other
Magnetic Forces Acting on Parallel
...
Magnetic Forces Acting on Parallel
Current Carrying Conductors
X
Two parallel
conductors
carrying currents
in opposite
dir...
Magnetic Forces Acting on Parallel
Current Carrying Conductors
X
South
North
South
North
Wrapping current carrying conduct...
The Armature of a Brush Commutated DC
Motor is made up of Current Carrying
Conductors Wrapped Around an Iron Core
The Moto...
The End
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Understanding dc motor_basics

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Understanding dc motor_basics

  1. 1. DC Current Electricity and Magnetism in Electrical Conductors
  2. 2. Electric Field An Electric Field or Force Surrounding a Charged Particle An electric field radiates outward from a positive charge and radiates in toward a negative point charge.
  3. 3. •The movement of Electric Charges is called Current. • Current is measured by the amount of charge (Coulombs) passing through the cross-sectional area of a conductor in a given period of time (Seconds). •A Conventional Current flows from a positive battery terminal to a negative battery terminal. Current Electricity
  4. 4. Electric Fields Drive Current Electricity
  5. 5. Conventional Current Assumes Charge Flows from Positive to Negative CationAnion
  6. 6. Ions contain CHARGES that create electric fields + + + + + + + + + + Current Electricity Batteries use electrochemical reactions to produce dissimilar charges used to create current in DC motors and circuits.
  7. 7. Ions contain CHARGES that create electric fields. These opposite electric fields produce imbalanced forces necessary to move the charges through the circuit. + + + + + + + + + + Current Electricity The electric field produced in a battery forces current through an electric circuit or conductor connected across the battery poles,
  8. 8. A current created by the unidirectional movement of charge(s) through a conductor is called a direct current. This current is produced by all batteries + + + + + + + + + + + + + + ++ + + +
  9. 9. When current moves through a conductor a circular magnetic field is induced around the conductor Magnetic Field Lines Negative Battery TerminalPositive Battery Terminal
  10. 10. The Right Hand Rule The direction of the magnetic field surrounding the conductor can be found using your right hand Position the thumb of your right hand pointing in the direction of conventional current (Positive to Negative) and your fingers will wrap around the conductor in the direction of the induced magnetic field.
  11. 11. The Direction and Motion of an Induced Magnetic Field in a Conductor Current Coming Towards You Current Moving Away From You X
  12. 12. When current moves through a coiled conductor a circular magnetic field is induced about the coil Current and Magnetism in a Coil
  13. 13. Motor (armature) rotation is caused by the simultaneous attraction and repulsion between the electromagnetic field in the armature and a fixed magnetic field Fixed Magnets Armature
  14. 14. Induced Magnetic Field (Due to current) Fixed Magnetic Field Force A Conductor in a Fixed Magnetic Field A Current Carrying Conductor in a Fixed Magnetic Field
  15. 15. N S A Motor Armature in a Fixed Magnetic Field The magnetic field surrounding a current carrying conductor interacts with an existing magnetic field. Direction of Force (Torque) acting to turn the Armature (Conductor)
  16. 16. Fleming's Left Hand (Motor) Rule Determines the direction of DC current carrying conductor in a fixed magnetic field Thumb = Direction of Conductor Motion Fore Finger = Direction of Fixed Magnetic Field (N to S) Middle Finger = Conventional Current Direction
  17. 17. Fleming's Left Hand (Motor) Rule N S Direction of Rotation Fixed Magnetic Field Direction Conventional Current Direction
  18. 18. N S N S Use the Left Hand Rule to Determine the Rotation Direction of the Armatures in A and B Notice that when the current through the armature is reversed, it moves (Rotates) in the opposite direction A B Hint: You will have to turn your left hand upside down for example A
  19. 19. Two parallel conductors carrying current in the same direction will attract each other Magnetic Forces Acting on Parallel Current Carrying Conductors
  20. 20. Magnetic Forces Acting on Parallel Current Carrying Conductors X Two parallel conductors carrying currents in opposite directions will repel each other, and they will set up a polarized magnetic field between themselves. North South
  21. 21. Magnetic Forces Acting on Parallel Current Carrying Conductors X South North South North Wrapping current carrying conductors around an iron core creates an electro magnet
  22. 22. The Armature of a Brush Commutated DC Motor is made up of Current Carrying Conductors Wrapped Around an Iron Core The Motor Armature is an electro Magnet and Operates according to the Principles Described in this Slide Show
  23. 23. The End

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