Electromagnetism 1
Electromagnetism 2
Electromagnetism 3
Electromagnetism 4
Electromagnetism 5
100
When a current flows through a wire, this is produced.
What is a magnetic field?
100
Like poles of a magnet will ....
What is repel?
100
A transformer that increases the voltage is known as this.
What is a step up transformer?
100
These are groups of atoms which have aligned themselves to all face in the same direction.
What are domains?
100
This is the area around a magnet where the force is exerted.
What is a 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.
What is less voltage?
200
A transformer that decreases the voltage is known as this.
What is a step down transformer?
200
This is a device that uses an electromagnet to convert electrical energy into mechanical energy.
What is an electric motor?
200
This rotates within an electric motor.
What are coils of copper wire?
200
This is a current which alternates direction in a cycle, typically reversing direction 50-60 times per second.
What is alternating current?
300
A device that changes the voltage of electric current is known as this.
What is an electric transformer?
300
An advantage of using an electromagnet.
What is 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.
What are electrons, atoms, and domains?
300
Magnetism produced by electric current is known as this.
What is electromagnetism?
300
Generators used to power homes and cars tend to produce this type of electrical current.
What is alternating current?
400
This is the reason the ends of a bar magnet have a stronger force.
What is the force is strongest at the poles?
400
A device that changes mechanical energy into electrical energy via electromagnetic induction is known as this.
What is a generator?
400
To construct an electromagnet you need an iron core, a power source, and ________.
What is a conductive wire?
400
This is used to turn a shaft in an electric motor.
What the repulsion (interaction) between a permanent magnet and an electromagnet?
400
To increase the electric current in a motor or electromagnet one must...
What is increase voltage?
500
Is this piece of iron going to act as a magnet?
What is no?
500
These are the three ways to increase the strength of an electromagnet.
What is increasing the number of turns in the coil, using a larger iron core, or increasing the amount of current?
500
When a wire is exposed to a changing (rotating) magnetic field, this is produced.
What is an electrical current?
500
This is a conductive wire wrapped around a bar of iron or other ferromagnetic material.
What is an electromagnet?
500
The process of generating electric current with a changing (rotating) magnetic field is called this.
What is electromagnetic induction?