Magnets
The name of the magnetic poles
North and South
Type of metal in Electromagnets
Soft magnetics
Unit of Electromagnetic force
Newton
What happens when a coil is placed in a magnetic field and a current flows through?
It rotates
A north pole with a north pole _______ eachother
repel
What is an electromagnet made of?
A soft magnetic metal, wire and a power source
What cause the electromagnetic force on a wire located in a magnetic field
The interraction of magnetic fields when an electrical current flows through the wire
The purpose of the brushes
Create electrical contact while allowing rotation
The type of metal that can become magnet
Ferromagnetic
Why Electromagnets cannot be made of Hard magnetic
It would make permanent magnet
The equation of the magnetic force
F = I*L*B*sin(theta)
The purpose of commutator
Reverse the direction of current to keep the rotation going
An example of natural magnetism on Earth
Magnetic field of the planet
Real life example of the use of an electromagnet
Car starter
The Force on a 3m rod in a 5T magnetic field if a 2A current flows through it. The field and the current are at 90 degrees
30N
How can we make an electric motor more powerful
Increase current, increase magnetic field, more coils, better conducting materials and connections, etc.
The difference between Soft and Hard magnetic materials
Soft can be temporary magnets and Hard can be Permanent magnets
One way to make an electromagnet more powerful
Increase current
The direction of the force produced by a current going east in a mganetic field going north. (use right hand rule)
Out of the screen towards you
Tell me how an electric motor works and what can we do with it?
A electric current flows through the coils in a magnetic field to make the shaft rotate with the help of brushes and commutator. We can then accomplish mechanical tasks (conversion of electric power to mechanic power)