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Static Electricity

THE ATOM. The nucleus. Protons are positive . (neutrons are neutral). 02 January 2012. Electrons are negative. Static Electricity. Keywords Static, Current, atom, nucleus, electron, proton, neutron, insulator, conductor, attract, repel, negative, positive, earthed. Outcomes.

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Static Electricity

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  1. THE ATOM The nucleus. Protons are positive. (neutrons are neutral) 02 January 2012 Electrons are negative Static Electricity Keywords Static, Current, atom, nucleus, electron, proton, neutron, insulator, conductor, attract, repel, negative, positive, earthed.

  2. Outcomes • ALL MUST recall that rubbing insulators together leaves them electrically charged and able to exert a force on each other. • MOST SHOULD recall the effect of forces between charged insulators. • SOME COULD explain the charge on insulators because electrons are moved and explain how this is important in a real life context.

  3. Van de Graaf • Your teacher will show you the Van de Graaff generator. • How does a balloon stick to a wall? How is this similar to lightning and how can we stop lightning from striking? http://www.youtube.com/watch?v=ipAemhMEKwE&feature=related

  4. Practical Time • To explain why a balloon sticks to a wall and how lightning conductors work we need to be able to explain how static causes forces. • Method • Take 2 plastic rods. • Rub one against a duster and place it on an upturned watchglass. • Take another rod. • Describe what happens.

  5. What have we learnt? The forces between charges can be investigated using rods made of insulating materials. acetate rods What happens when two positively-charged acetate rods are placed near each other? The rods repel each other because they have the same overall charge. What will happen if one rod is replaced with a charged polythene rod? rods repel each other

  6. How do opposite charges behave? polythene rod acetate rod When a charged acetate rod is placed near a charged polythene rod, the rods attract each other. Why does this happen? The polythene rod has an overall positive charge and the acetate rod has an overall negative charge. The overall charges of these rods are opposite and so they attract each other. rods attract each other

  7. To show your understanding of Static answer these 2 q’s:1) How does a balloon stick to a wall? 2) How is this similar to lightning and how can we stop lightning from striking? 1) Draw a diagram of a balloon stuck to a wall. Use as many of the keywords to label and help explain how it sticks to the wall. Will it stay on the wall for ever? Why / Why not? 2) Now draw a thunderstorm cloud and the ground. Why does lightning strike? How can a lightning rod stop the lightning? Keywords Static, Current, atom, nucleus, electron, proton, neutron, insulator, conductor, attract, repel, negative, positive, earthed.

  8. To show your understanding of Static answer these 2 q’s:1) How does a balloon stick to a wall? 2) How is this similar to lightning and how can we stop lightning from striking? 1) Draw a diagram of a balloon stuck to a wall. Use as many of the keywords to label and help explain how it sticks to the wall. Will it stay on the wall for ever? Why / Why not? 2) Now draw a thunderstorm cloud and the ground. Why does lightning strike? How can a lightning rod stop the lightning? Keywords Static, Current, atom, nucleus, electron, proton, neutron, insulator, conductor, attract, repel, negative, positive, earthed. NO LIGHTNING

  9. Peer Assess • 1) WWW/EBI: Did they draw the diagram and label it with keywords? Did they explain how to charge the balloon up? Did they explain how the balloon would stick to the wall because of the attraction of the charges? Did they use lots of keywords? • 2) WWW/EBI: Did they draw a diagram and label it with keywords? Did they explain how the cloud gets charged up? Did they explain how the charges in the ground move? Did they explain how a lightning rod takes the charge from the cloud to keep you safe?

  10. Redraft your answer because of the feedback you’ve been given. OR Do the Extension: (if you have no corrections to make): Write a verse to a poem about today’s lesson, the first letter of each line spells out static (try to use as many keywords as possible) S T A T I C Keywords Static, Current, atom, nucleus, electron, proton, neutron, insulator, conductor, attract, repel, negative, positive, earthed.

  11. Tell me two things...(for each) • that you have done well this session • that you know now that you didn’t know at the start • that you could do better next time • that you would like to know more about 2

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