Show:
Magnets and Magnetism 1
Magnets and Magnetism 2
Magnetism from Electricity
Electricity from Magnetism
Transformers
100
Any material that attracts iron
What is a magnet
100

Magnetic poles are always in _____________

pairs

100
the study of the interaction between electricity and magnetism
What is electromagnetism
100
What did Faraday and Henry discover?
That you a magnetic field can induce or create an electric current.
100

What type of current is used in a transformer

AC

200
What 3 properties do all magnets have?
1) They have a north pole and a south pole 2) They exert a force 3) They are surrounded by a magnetic field
200

In magnetic forces, like poles ______________ and opposite poles ______________

Like poles repel (push apart) and opposite poles attract (stick together)

200
A coil of wire that produces a magnetic field when carrying an electric current.
What is a solenoid
200
The process by which an electric current is made by changing a magnetic field
What is electromagnetic induction
200

What is a step up transformer

A transformer that increases the voltage in the secondary coil

300
The region around a magnet where the magnetic force can act
What is a magnetic field
300
A coil of wire wrapped around an iron core
What is an electromagnet
300
This machine uses electromagnetic induction to change mechanical energy into electrical energy.
What is an electric generator
300

What is a step down transformer

A transformer that decreases the voltage in the secondary coil

400

What happens when you cut a magnet into 2 pieces? Why?

Each piece will have a north pole and south pole because the domains inside the magnet re-align.

400
What is an electric motor?
A device that changes electrical energy into mechanical energy.
400
Faraday's experiment demonstrated that the ___________ current was made only when the _______________ field was changing.
What is electric current and magnetic field
400

Give one practical example of Step Down Transformer

To give the proper voltage to a home. Answers will vary

500
Name 2 kinds of magnets and what they are made of.
1) ferromagnets are made of iron, cobalt, nickel 2) electromagnets are made from a magnet and an electric current
500

Why does a compass needle point north?

Because the magnetic pole closest to the geographic north pole is the magnetic south pole.

500
What 2 ways can you increase the power of an electromagnet?
By increasing the number of loops of wire around the solenoid and increasing the current.
500
Explain the 3 steps of how an electric generator works
1) A crank is turned rotating the wire coil through the magnetic field 2) This creates an electric current in one direction. 3) As the coil continues to rotate, the electric current continues in the opposite directin.
500

Solve for V2 when V1 = 200, N1= 100, N2 = 200

400 volts