ملخص Electricity and Magnetism العلوم منهج انجليزي الصف 3

ملخص Electricity and Magnetism العلوم منهج انجليزي الصف الثالث

Unit 2: Electricity and Magnetism

All matter is made of small, tiny particles

Particles have either positive charges or negative charges

Electrical charges: the property of matter thar causes electricity

A discharge (removing of charges) occurs when static electricity moves from one object to another

An object with a sxysitive arri an with a negative charge attract Objects that txRh have a push each other away

Objects that txth have a negative also push other away

All objects are made of charged particles

When the positive and negative charges are equal the object is electrically neutral (charges are balanced)

Negative charges can move from one object to another, when the two objects touch each other

Static electricity : buildup of electric charges on the object

Electric current : A flow Of electric charges in a wire used_in our daily life, it’s used to lights, radios computers and many home appliances

American scientist, he improved the design of electric light bulbs

Lesson 2: Magnetism and designing solution

A magnet: is made of material that can attract objects made of iron, steel, cobalt & nickel

Lesson 2: Magnetism and designing solution

A magnet : is made of material that can attract objects made of iron, steel, cobalt & nickel

Magnetism : the ability of an object to push or pull another object Magnets are made of different shapes and sizes

Magnets have 2 poles one is north pole(N) and the other is south pole(S)

Pole: is one of the two ends of magnet

The pole of the magnet has the strongest attraction force Two magnets each other when the south of one faces the north of the Two repel each other when their south face each other

Two magnets also regxl each other when their north face each other

Magnetic field: is the Area around the magnet where its force can attract or repel We cannot see magnetic field, but we can
feel where it is Earth’s Magnetic field: the Earth is Like a huge magnet it has magnetic field due to the huge iron deep in its core and it has two magnetic poles

A compass : is a tool that helps you to find the directions (north, south, east, and west)

The needle of the compass is magnet

Magnetic field can be produces from electric current

If you wind a coil around a piece of iron and connect a battery, the piece of iron will be a magnet (Electromagnet)

Electromagnet is stronger when

i) Increase number Of batteries

ii) Increase number of coil tums

Electromagnets are used in many appliances as speakers and doorbell

Pynamo : is a simple tcxl that changes motion energy into electricity in the presence Of a magnet that spins inside a coil of wire Best wishes my dear students

Ms. Samar Madian