Electromagnets

Electromagnet

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Electromagnet

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil.

electric ------> magnet

Electromagnet is a temporary magnet.

The temporary means the magnet field will appear, if a current flows through the coil.

Multiple Choice

What is an electromagnet?

• a temporary magnet made from current carrying wire around a magnetic metal core.
• a permanent magnet with a north and south pole

Multiple Choice

How are electromagnets different from magnets?

• magnets have a North and South pole

• you can turn an electromagnet on/off

• magnets are more powerful

Electromagnet components

Battery provides the energy or the power source to run the electromagnet.

The wire provides the pathway to carry electricity from component to component.

The magnetic material core becomes a temporary magnet when electricity is flowing through the circuit.

Multiple Choice

Which component provides the energy or the power source to run the electromagnet?

• Iron nail

• wire

• Switch

• Battery

Multiple Choice

What component provides the pathway to carry electricity from component to component?

• battery

• wire

• switch

• iron nail

Multiple Choice

What component becomes a temporary magnet when electricity is flowing through the circuit?

• iron nail

• copper wire

• battery

• switch

Electromagnet

The magnetic field will stronger if:

The electric current increase.

The number of turn of coil increase.

The magnetic field of electromagnet is also depend on the core.

If we put the iron (magnetic material) inside the core the electromagnet will stonger than we left the core with only the air.

Multiple Choice

What would increase the strength of an electromagnet?

• Increasing the amount of current flowing through the wire.
• Inserting a wooden core inside the coil
• Changing the direction of the current
• Decreasing the number of coils of wire

Using the Right-Hand Rule 

The tumb will show North direction while the other fingers show current direction.

Electric generator

 The electric generator is a device that converts mechanical energy into electrical energy.

magnet ---> electric

First phenomena founded by Micheal Faraday

Multiple Choice

What is the device which converts mechanical energy to electrical energy?

• electric generator

• electric motor

Faraday experiment

https://micro.magnet.fsu.edu/electromag/java/faraday2/

Multiple Choice

According to the experiment, if we move the the magnet faster the current will be___

• The current will be greater

• The current will be weaker

Multiple Choice

According to the experiment, if we replace the coil with greater number of turn, ____

• The current will be greater

• The current will be weaker

Electric generator

• We can produce the electricity by rotating electric conductor between two magnets.

• The electricity will greater if :

  • we replace the stronger magnet.
  • we rotate the conductor in faster rotation.

  
  

Multiple Choice

What is the name of this device?

• electric circuit

• electric motor

• generator

• electromagnet

Application of Electric Generator

Multiple Choice

Huge wheels that rotate when pushed by water, wind or steam.

• turbines
• leads
• magnets

Multiple Choice

Used at powerplants to produces elecrical energy for our homes.

• generator
• electric motor
• electromagnet

Multiple Choice

Produces an electric current when a coil of wire wrapped around an iron core is rotated near a magnet.

• generator
• electric motor
• electromagnet

Multiple Choice

AC generator converts:

• Mechanical energy to electrical energy

• Electrical energy to mechanical energy

• Heat energy to mechanical energy

• Chemical energy to electrical energy

Lets take inspire

Multiple Choice

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

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

Multiple Choice

What is formed when a wire in an electric circuit is wrapped around an iron core producing a magnetic field?

• electromagnet
• generator
• magnet
• electric motor

Multiple Choice

What would happen if you took one end of the wire off the battery?

• The nail will be a magnet.

• The nail would no longer be a magnet

• Nothing will happened.

• The nail will heats up.

Multiple Choice

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

Multiple Choice

Which of the following do EM waves transport?

• electric charge

• energy

• frequency

• wavelength

Multiple Select

What type(s) of waves does your cell phone give and receive?

• X-rays

• Gamma Rays

• Radio waves

• Microwaves