UNIT-7ELECTRICITY AND MAGNETISM

By Carmen Ramos

·What are the materials called when theyattract objects made of steel or iron?

They are calledmetals

They are calledminerals

They are calledmagnetic

STATIC ELECTRICITY

Static electricity occurs when you rub objects together.Objects can be:·Neutral: This is when an object has a differentnumber of positive and negative charges·Electrically charged: This is when an object has a different number of positive charges and negative charges

OBJECT BEHAVIOUR TOWARDS ELECTRICITYDepending on their electrical charges, different things occur when two objectswith electrical charge are near each other: ·Objects with different electricalcharges attract each other.Like when you comb your hair.·Objects with the same electrical chargesrepel each other. Like when you rub twoinflated ballons with a piece of wool.

CONDUCTING AND INSULATING MATERIALS ·Conducting materials: Electrical charges can movethrough them easily.

·Insulating materials: Electrical charges cannot movethrough them.

ELECTRIC CIRCUITSElectric current is the movementof electrical charges through a conducting material.The mainparts of an electric circuit are:

·Current generator.·Conducting elements or wires.·Devices or receivers:

·Switch.·Electricity meter.·Protection devices or circuit breakers.

USES OF ELECTRIC CURRENTElectric current has many uses:·Light, images and sound.·Heat.·Movement.·Communication.

MAGNETSMagnets can attract certain metals. They can be:·Natural: like magnetite·Artificial.

All materials have two parts , their north poles (N) and their south poles (S).

CHARACTERISTICS OF MAGNETS·You can never separate the poles of a magnet·When we put two magnets together,two things can happen:

-They repel.-They attract.

THE MAGNETIC POLES OF THE EARTHOur planet has a north magnetic pole and a south magneticpole. We use a compass to show us where the Earth’s northmagnetic pole is.

USES OF MAGNETISMMagnetism has different uses:·Orientation.·Magnets.·Information storage.·Theft control.·Identification.

THE END By Carmen Ramos

6ºB