Welcome to Year 11 Extra Science!! Mr Hicks

Year 11 Extra Science Target grades for this group are A* A B And if you really flunk it….. C!

Module Number 12 Energy, Force and Communication

Lesson Objectives To understand what causes static charge. To appreciate some of the uses of static electricity To appreciate some of the dangers of electricity To know what static electricity is

Static Electricity There are two types of electric charge, POSITIVE and NEGATIVE Negative charge is made up of electrons from the outside of atoms

Static Electricity Positive charge is made up from protons. Protons are usually found in the nucleus of atoms.

Static Electricity Some materials become charged because friction cause electrons to be pulled off one material and transferred to another material.

Static Electricity Only electrons can move. Protons are “stuck” in the middle of atoms. Materials that have a positive charge are usually things that have “lost” electrons (not gained protons).

Static electricity You will be given some different materials. See which combination of materials you can use to lift small pieces of paper.

Static electricity Why can you not generate static charges with metal bars? Is there a different way of classifying the materials “metals” and “plastics”?

Static electricity Why must you use an insulating material to generate an electric charge? Why can you not hold a static charge on a conducting material?

Static electricity When polythene rod is rubbed with a duster Electrons are rubbed off the duster onto the rod… So the rod is left negative… and the duster positive

Static electricity When perspex rod is rubbed with a duster Electrons are rubbed off the perspex onto the duster… So the rod is left positive… and the duster negative

Static electricity Like charges repel Unlike charges attract. Electrons will always try and get as far away from each other as possible.

Static electricity Read page 53 of the text book and explain why EARTHING is important to protect buildings.