Magnets And Electromagnets Flashcards
What is th magnetic field
The space around a magnet that has an effect
Where is the field stronger
At the poles because it has a greater number of
Lines
What happens when a current flows
There’s a magnetic Field around the wire
How do
You build an electromagnet
You
Wrap a current carrying conducter around a soft
Iron
Core them connect to a battery
What do magnets have
2 poles
North and South
How do you increase magnetic effect
Increase current number of times and include a iron core
What does a solenoid do
Opens locks an automatic door
How do you
Work a solenoid
Switch is pressed and circuit is complete and iron core becomes an electromagnetic this attracts locking bar
What is a electromagnetic crane
Large electromagnet attached to a crane used to move large metallic objects
Bow do you
Work an electromagnetic crane
When it is turned on it attracts objects
What is a relay switch
Safety
Device
For machines
How do you
Work a relay switch
When the 12v circuit is closes it makes the electromagnet magnetic and attracts the 240 v circuit switch this completes ti secondary circuit and allows motor to
Switch on
How do
You
Work a electric bell
When switch is closed circuit is complete and current flows through electromagnetic coil
Why are carbon brushes good
Cheap,good,conductors and soft
Why are
Field coils
Good
Stronger,more
Easily shaped magnetic
Field and the motor is
Lighter and cheaper
Where is the field magnet
About the rotating
Coil
Where is the rotating coil
Below the field magnet
Where is the commutator
On the fromt of the rotating
Coil
Where are the brushes
On the commutator
What does a commutator do
Changes current every half turn to keep coil moving
What does the field magnet do
Produces field to allow rotating coil to move
What does the rotating coil do
Carries current
What do the brushes do
Makes electrical contact with the commutator
