EM 1
EM 2
EM 3
EM 4
EM 5
100
When a current flows through a wire, this is produced.
2X - Double Points
Magnetic field
100
Like poles of a magnet will _______
Repel
100
A transformer that increases the voltage is known as this.
2X - Double Points
A step-up transformer
100
These are groups of atoms that have aligned themselves to all face in the same direction.
Domains
100
This is the area around a magnet where the force is exerted.
2X - Double Points
Magnetic field
200
If the input coil has more coils than the output coil in an electrical transformer, then the resulting voltage will be this in relation to the input voltage.
Less voltage
200
A transformer that decreases the voltage is known as this.
A step-down transformer
200
This is a device that uses an electromagnet to convert electrical energy into mechanical energy.
2X - Double Points
An electric motor
200
This rotates within an electric motor.
Coils of copper wire
200
This is a current which alternates direction in a cycle, typically reversing direction 50-60 times per second.
2X - Double Points
An alternating current
300
A device that changes the voltage of electric current is known as this.
An electric transformer
300
An advantage of using an electromagnet.
2X - Double Points
The ability to turn it on and off
300
In order to be magnetic, an object must have all of these aligned to face the same direction.
Electrons, atoms, and domains
300
Magnetism produced by an electric current is known as this.
2X - Double Points
Electromagnetism
300
Generators used to power homes and cars tend to produce this type of electrical current.
Alternating current
400
This is the reason the ends of a bar magnet have a stronger force.
2X - Double Points
The force is strongest at the poles
400
A device that changes mechanical energy into electrical energy via electromagnetic induction is known as this.
A generator
400
To construct an electromagnet you need an iron core, a power source, and ________.
2X - Double Points
A conductive wire
400
This is used to turn a shaft in an electric motor.
The repulsion (interaction) between a permanent magnet and an electromagnet
400
To increase the electric current in a motor or electromagnet one must...
2X - Double Points
Increase voltage
500
Is this piece of iron going to act as a magnet?
No
500
These are the three ways to increase the strength of an electromagnet.
2X - Double Points
1. Increasing the number of turns in the coil
2. Using a larger iron core
3. Increasing the amount of current
500
When a wire is exposed to a changing (rotating) magnetic field, this is produced.
An electrical current
500
This is a conductive wire wrapped around a bar of iron or other ferromagnetic material.
2X - Double Points
An electromagnet
500
The process of generating electric current with a changing (rotating) magnetic field is called this.
Electromagnetic induction