The Motor Effect Flashcards
What happens when you put a current carrying wire (or conductor) between magnetic poles
The magnetic field around the wire interacts with the magnetic field it’s been placed in
Which causes the magnet and conductor to exert a force on each other
What is the motor effect
When a conductor/wire is put in between magnetic poles and they Exert a force on one another which can cause the wire to move
How will the wire feel a full force (of the motor effect)
The wire must be 90 degrees to the magnetic field
How does the force act that is created in the motor effect
The force will act at right angles to the magnetic field of the magnets and to the direction of current in the wire
How do you increase the magnitude (strength) of the force
With the strength in the magnetic field or the amount of current passing through the conductor
What is the good way of showing the direction of force from the motor effect
Apply a current to a set of rails inside a horse shoe magnet
What does the force acting on a conductor in a magnetic field depend on
The magnetic flux density
The size of the current trough the conductor
The length of the conductor in the magnetic field
What is the magnetic flux density
How many field lines there are in a region and this shows the strength of the magnetic field
What do you use to find the direction of force
Flemings left hand rule
How do you use Flemings left hand rule
First finger is direction of field
Second field is direction of current
Thumb will then point in the direction of the force (motion)
What is in an electric motor
A magnetic field and a wire on an axle so is able to rotate clockwise between the magnetic field
Why does the wire move clockwise
Because the current is acting in 2 directions between the two magnets so one side the force is upward and the other side the force is downward so it roared in the clockwise direction
What happens when the wire rotates to 90 degrees
It will stop rotating as the forces act against rotation due to the directions of their currents
What must you use to change the direction of current to keep the wire rotating clockwise
A split ring commutator
How will the split ring commutator work
The current is broken for a second but The wires will keep Turing at 90 degrees slightly due to momentum and then the circuit will connect again and the current switches direction
