P13 Flashcards
What are the circles around a wire?
The magnetic fild line
What is a solenoid?
A long coil of insulated wire which produces a magnetic field
Description of magnetic field lines in a sikenoid
They are parallel to its axis and are all in the same direction
What happens when increasing the current
The magnetic field gets stronger
What is an electromagnet
A solenoid that has an iron core and consists of an insulated wire wrapped around an iron bar
In the motor effect, the force is…..(2)
Increased if the current or the strength of the magnetic field is increased
-reversed if the direction of the current or the magnetic field is reversed
What is a electric motor
Consists of a coil that turns when a current is passed through it
What is a magnetic flux
A measure of the strength of a magnetic field
What are the three things that can effect the power o the electromagnetic?
- the corematerial
- the number of coils
- the size of the current
If a wire carrying a current is placed in a magnetic field what does it experience?
A force
How can the direction of the force be reversed by
-By reversing the current
The size of the force can be increase by increasing…
Type of metal
Strength of current flowing through
What is the function of a commutator
Reverses the direction of the current around the coil every hald-turn of the coil
