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UNIT 5 ELECTRICITY AND MAGNETISM

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Electrical charges What is lightning? Lightning is an electrical discharge.

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Electrical 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.

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Electrical charges Do thunder and lightning occur at the same time? They do occur at the same time. However light travels much faster than sound.

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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 CHARGED OBJECTS Have more positive than negative charges NEGATIVELY CHARGED OBJECTS Have more negative than positive charges NEUTRAL OBJECTS Same number of + and - charges

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+- ++ - - Objects with opposite charges attract Objects with the same charges repel

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Static electricity Have you ever felt little shocks or seen sparks when you touched something? TELL US

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Static electricity

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YOU 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.

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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.

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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.

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