Electromagnets

Open Ended

Why is the study of electromagnets important in our daily lives?

Multiple Choice

What is electric current?

• A continuous flow of electric charges from one region to another

• A type of magnetic field

• A form of light energy

• A chemical reaction

Multiple Choice

What is the primary function of an ammeter?

• To measure electric charge

• To measure voltage

• To measure resistance

• To generate electricity

Open Ended

Explain how the movement of electric charges in a wire can create a magnetic field.

Multiple Select

Which of the following statements about electromagnetism are correct?

• Electromagnetism is the interaction between electricity and magnetism.

• Changing the shape of a wire changes the shape of the magnetic field.

• A straight wire generates a stronger magnetic field than a looped wire.

• Changes in the magnetic field can affect electric charges.

Fill in the Blanks

A solenoid is a coil of wire that uses loops to concentrate the magnetic field into a

area.

Fill in the Blanks

The strength of an electromagnet increases as the number of

around the core increases.

Multiple Choice

In the experiment shown, what is the purpose of the battery connected to the coil of wire?

• To create an electric current that generates a magnetic field

• To provide light for the experiment

• To measure the resistance of the wire

• To cool down the coil

Multiple Choice

What happens to the strength of an electromagnet when the electric current flowing through its wire is increased?

• The electromagnet becomes stronger

• The electromagnet becomes weaker

• The electromagnet stops working

• The electromagnet reverses polarity

Multiple Select

Which of the following factors will increase the amount of current induced in a wire during electromagnetic induction?

• Moving the magnet more quickly near the wire

• Using a stronger magnet

• Increasing the number of loops in the wire

• Keeping the magnet stationary

Open Ended

Explain how electromagnetic induction can generate an electric current in a wire. Use the diagrams and information provided to support your answer.

Fill in the Blanks

A current can be induced in a wire if either the magnet or the

is moving.

Multiple Choice

How does electric current enable the functioning of electromagnets, such as the one shown lifting metal objects?

• By creating a magnetic field when current flows through a coil

• By heating up the metal objects

• By producing light energy

• By chemically reacting with the metal

Motor

An electric motor is a device that uses an electric current to produce motion.

Has three main parts.
1. coil of wire connected to a rotating shaft
3. a permanent magnet.
3. A source of electric energy.
'
electric energy is transferred to mechanical energy.

Multiple Choice

Electric motors are devices that convert _____ energy into  _____ energy.

• electrical; mechanical
• mechanical; electrical
• chemical; potential
• mechanical; kinetic

​Generator

Electric generator: a device that uses a magnetic field to transfer mechanical energy to electric energy.

The crank rotates a wire coil through the magnetic field of a small permanent magnet.

Multiple Choice

Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

Multiple Choice

In a _______ a spinning turbine moves magnets which generates an electric current.

• Motor

• Generator