UNIT 5ELECTRICITY AND MAGNETISM

Electrical chargesElectrical charges

What is lightning?

Lightning is an electrical discharge.

Electrical chargesElectrical charges

What produces it?

It is produced by a strong electric current created between the negative charge at the bottom of a thunder cloud and the positive charge of the Earth’s surface.

Electrical chargesElectrical charges

Do thunder and lightning occur at the same time?

They do occur at the same time. However light travels much faster than sound.

ELECTRICAL CHARGES¿Do you think all objects have electric charges?

POSITIVE CHARGE

YES; electric charge is a characteristic of matter

NEGATIVE CHARGE

Negative charges can move from one place or object to another

POSITIVELY CHARGEDOBJECTS

Have more positive than negative charges

NEGATIVELY CHARGEDOBJECTS

Have more negative than positive charges

NEUTRAL OBJECTSSame number of + and -

charges

+ -+ +- -

Objects with opposite charges attract

Objects with the same charges repel

Static electricityStatic electricity

Have you ever felt little shocks or seen sparks when

you touched something? TELL US

Static electricityStatic electricity

Static electricityStatic electricityYOU KNOW NEGATIVE CHARGES MOVE FROM BODY TO BODY.IF YOU FIRSTLY PASS ALL YOUR NEGATIVE CHARGES ONTO THE BALLOON, NEXT YOUR HAIR IS CHARGED ONLY WITH POSITIVE CHARGES.

CONSEQUENTLY THE BALLOON IS NEGATIVELY CHARGED.FINALLY; YOUR HAIR STICKS TO THE BALOON AS YOU KNOW THAT OPOSITES ATTRACT.

Copy and complete these sentences

There are two types of electrical charge.__________________.

If an object has more positive than negative charges, it is ___

_______________________.

If an object has more negative than positive charges, it is ___

___________________________.

If an object has the same number of positive and negative

charges it is ________________.

Objects with opposite charges ______________ each other.

Objects with the same charges______________each other.

__________charges can____________ from one place or

object to another.

Copy and complete these sentences

There are two types of electrical charge._Positive and Negative.

If an object has more positive than negative charges, it is ___

__Positively charged_______.

If an object has more negative than positive charges, it is ___

__Negatively charged_________.

If an object has the same number of positive and negative

charges it is ___neutral___.

Objects with opposite charges ___attract_____ each other.

Objects with the same charges___repel____each other.

_Negative__charges can___move___ from one place or object

to another.