Complete the concept map comparing series circuits to ... · Complete the concept map comparing...

Complete the concept map

comparing series circuits to parallel

circuits.

Materials Managers – get the journals

for your team

Practice Sheet #23 is due tomorrow!

D. F. Goldsberry Cooper Middle School

What is the key difference that

causes one atom of one element

to be different from an atom of a

different element?

The number of protons in the atom

What happens when elements

form a mixture?

Elements keep their original

properties because there is no

chemical reaction.

Review the structure of the atom.

Name the three subatomic particles, their

charges, and their locations.

Protons are positive and are found in the

nucleus.

Neutrons are neutral and are also found

in the nucleus.

Electrons are negative and are found in

the electron cloud outside the nucleus.

The amount of matter present before

a change is the same as the amount

present after the change.

What does the Law of Conservation

of Matter say?

How is a mixture different from a pure

substance?

In a pure substance all the particles are

the same kind of atoms or molecules. In a

mixture, there are different kinds of atoms

or molecules.

A mixture can be separated by physical

means and each ingredient in a mixture

retains its own chemical identity.

S8P5. Students will recognize characteristics of

gravity, electricity, and magnetism as major

kinds of forces acting in nature.

b. Demonstrate the advantages and

disadvantages of series and parallel circuits and

how they transfer energy.

c. Investigate and explain that electric currents

and magnets can exert force on each other.

What is the difference

between a motor and a

generator?

Why does a compass point

to the Earth’s North Pole?

Key Idea

A compass points to the

Earth’s North Pole because

the Earth acts like a giant

magnet. (The core of the

Earth is mostly molten

iron.) D. F. Goldsberry Cooper Middle School

Earth has a north

magnetic pole and a south

magnetic pole.

Earth’s magnetic poles

are not exactly the same

locations as the

geographic poles (axis

where the Earth spins).

A compass can be used to

find directions because its

needle lines up with the

Earth’s magnetic poles.

Consider the following:

What would happen to the

magnetic properties of a

bar magnetic if you cut it

into two pieces?

How can a magnet lose its

magnetic properties?

Record in your notes:

Losing Magnetic Alignment by:

a) Dropping a magnet or hitting it too hard

b) Putting magnet in opposite field for too

c) Increasing the temperature

Key Idea

An electromagnet is a coil of current-carrying wire that acts as a magnet that can be turned on and off.

Solenoid = a current-carrying coil of wire with many loops.

When a solenoid is turned on, a magnetic field is created.

Record in your notes

If a piece of iron or other ferromagnetic material is wrapped by the coils of wire in a solenoid, a magnet is created when the current is turned on.

The strength of an electromagnet

can be increased by:

1) Increasing the electric current in

the solenoid

2) Increasing the number of coil

loops around the ferromagnetic

material

3) Using a stronger ferromagnetic

material (more iron content)

Examples of Electromagnet Uses:

a) A doorbell or an alarm

b) Moving junk cars

c) Recording data on your

computer

d) Reading the magnetic strip on

the back of a credit card

b) Moving junk cars

c) Recording data on your

computer

d) Reading the magnetic strip on

the back of a credit card

e) Electric motors

Big Idea about

Electricity and Magnetism

Electromagnetism - interaction

between electricity and magnetism

Big Idea about

Electricity and Magnetism

a. Magnetic forces arise from the

movement of electrical charge.

b. Electrical forces arise from the

movement of a magnet (induced

current)

Motors

An electric motor is a device that

changes electrical energy into

mechanical energy.

All electric motors have an armature—a

loop or coil of wire that can rotate. The

armature is mounted between the poles

of a permanent magnet or electromagnet.

Generators

A generator is a device that uses

electromagnetic induction to change

mechanical energy into electrical

energy.

An electric current is made when a

magnet moves in a coil of wire or when a

wire moves between the poles of a

magnet (electromagnetic induction).

Task #1 – Index Card (Front) 1. Why are some substances magnetic?

2. What happens if you cut a magnet in half?

3. Name three uses of magnets in everyday life.

Task #2 – Index Card (Back)

Answer questions for three mini-labs.

Task #3 – Review Quiz Questions

Task #4 – Complete Practice Sheet #23

Complete the concept map comparing series circuits to ... · Complete the concept map comparing...

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