1 / 22

What charge does a polythene rod have after it has been rubbed with a duster?

What charge does a polythene rod have after it has been rubbed with a duster? Name the particles that have moved to make this happen. Did these particles move from the polythene rod or from the duster? What charge does an acetate rod acquire when rubbed with a silk cloth?

calla
Download Presentation

What charge does a polythene rod have after it has been rubbed with a duster?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What charge does a polythene rod have after it has been rubbed with a duster? Name the particles that have moved to make this happen. Did these particles move from the polythene rod or from the duster? What charge does an acetate rod acquire when rubbed with a silk cloth? Name the particles that have moved to make this happen. Did these particles move from the acetate rod or from the silk cloth? What happens if two negatively charged objects are brought near each other? What happens if two positively charged objects are brought near each other? What happens if a positively charged object is brought near a negatively charged object?

  2. Negative Electrons Duster Positive Electrons Acetate rod They repel They repel They attract

  3. Lesson.2: Static, from Daft to Dangerous Objectives Be confident in explaining some of the phenomena involving static electricity in some scientific detail. List and explain some of the methods for preventing the build up of static electricity.

  4. Earthing Safely A charged conductor can be discharged by connecting it to earth with a conductor.

  5. Earthing, but not so safely The greater the charge on an object, the greater the voltage between the object and earth (0 Volts). If the voltage becomes high enough, a spark may jump across the gap between the object and any earthed conductor which is near to it.

  6. Lightning can be reproduced in the lab!

  7. Van de Graaff time!!!

  8. Van de Graaff time!!! Do not touch the person on the platform Always keep one hand on the Dome Never step off the platform Do not take part if you have any heart issues

  9. Discussion Card Activity.

  10. Homework Explain one of the static daft or dangerous situations to somebody at home.

  11. Describe and recognise that when some materials are rubbed they attract other objects: • small pieces of paper or cork to a rubbed comb or strip of plastic; • certain types of dusting brushes become charged and attract dust as they pass over it. • Recognise and describe how you can get an electrostatic shock from charged objects: • synthetic clothing. • Explain how static electricity can be a nuisance: • dirt and dust attracted to insulators (plastic containers, TV monitors etc); • causing clothing to “cling”. • Recognise and describe how you can get an electrostatic shock if you become charged and then become earthed: • touching water pipes after walking a floor covered with an insulating material e.g. vinyl.

  12. Explain how static electricity can be dangerous when: • in atmospheres where explosions could occur eg inflammable gases or vapours or with high concentrations of oxygen; • in situations where large quantities of charge could flow through the body to earth. • Explain how the chance of receiving an electric shock can be reduced by: • ▪ correct earthing; • ▪ use of insulating mats; • ▪ using shoes with insulating soles • Explain why it is necessary to earth lorries containing inflammable gases and liquids and powders before unloading. • Explain how anti-static sprays, liquids and cloths help reduce the problems of static electricity.

More Related