Live Classroom 9/25 Electromagnets and Review

​Lesson 1.2.8 - Electromagnets

• explain how magnetic and electric forces are related

• build a simple electromagnet

• New vocabulary: electromagnet and solenoid

  
  
  

Drag and Drop

A type of energy that results from charged particles is ​

Placeholder

An ​

Placeholder

​ is an area of electric force around a charged particle. A​ ​

Placeholder

is an object with a north and south pole that produces a magnetic force.

Drag these tiles and drop them in the correct blank above

electricity.

electric field

magnet

​

An electromagnet is an object that acts as a magnet when electricity passes through it.

Electromagnets generally produce stronger electric force than a standard magnet.

Electromagnets come in many sizes and shapes.

However, all electromagnets contain:

• power source

• copper wire

• iron core

Note that the wire wraps around the iron core. Coiling the wire causes the electromagnet to take on new properties.

​power
source

​copper
wire

​iron core

​



Electromagnets combine the properties of both electricity and magnetism.

Today and tomorrow, think about the ways that electricity and magnetism are related.

The wire coiled around the iron core of an electromagnet is called a solenoid.

Solenoids cause electromagnets to produce stronger magnetic fields than electromagnets without solenoids.

The more coils, or turns, in a solenoid, the stronger the magnetic force it will produce.

​

Solenoid

Multiple Select

Which of the following will increase the strength of the magnetic field produced by an electromagnet?

• Adding an iron core in the solenoid

• Use fewer wire coils in the solenoid

• Use a non-magnetic core material in the solenoid

• Increase the number of wire coils in the solenoid

Electricity and Magnetism Quiz


Monday, Sept. 30

Let's review !

Draw

CIRCLE the poles of the magnet and a put STARS where the magnetic force is greatest.

Dropdown

The curved lines represent Earth's ​

Select answer

​Notice and explain:

Activity and discussion:


Take out your compass and bar magnet or go to https://phet.colorado.edu/sims/html/magnet-and-compass/latest/magnet-and-compass_all.html

Move the compass close to the north pole (red) of your magnet.

In what direction is the north side of the needle on your compass pointing in relation to the magnet. Why?
Now move the compass to the south pole of your magnet (blue). What happens to the needle? Why?

Dropdown

The blue circles represent protons and the yellow circle represent an electron.



What do the lines with arrow represent? ​

Select answer

Labelling

Label the electromagnet.

Drag labels to their correct position on the image

iron core

solenoid

power source

• Force between charged particles and involves the transfer of electrons

Electric Force

• Attracted to certain metals and has two poles

​Magnetic Force

Magnetic compared to Electric Force

​Both: opposites attract, act across empty space, have two distinct areas (poles and charges), use field lines to model