1 / 6

4.1 Electrical Charges

15 October 2014. 4.1 Electrical Charges. Opposite charges attract Same charge repels. Insulating materials that lose electrons become positively charged. Gaining electrons makes an object negative. Van de Graaff generator Over 100,000 Volts!.

avian
Download Presentation

4.1 Electrical Charges

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. 15 October 2014 4.1 Electrical Charges • Opposite charges attract • Same charge repels. • Insulating materials that lose electrons become positively charged. • Gaining electrons makes an object negative. Van de Graaff generator Over 100,000 Volts! Crackling noises when taking off some clothes is caused by many tiny sparks.

  2. Static experiments • Rub a polythene (White) rod with a cloth. • Hold the rod near some dry paper. • Hold the rod near a stream of gently running water. • Hold the rod near someone’s hair. • Rub an acetate (clear) rod with a cloth. • Repeat the above experiments. Explain why this happens.

  3. Charging by friction Polythene Uncharged – equal numbers of protons and electrons + - + - + - + - + - + - + - + - + - + - After rubbing - - - + - + - + - + - + - + - + - + - + - + - cloth rod + + + + + + + - - - - Gains electrons making it __________. Loses electrons making it __________. Perspex becomes positively charged after rubbing. Explain why.

  4. Van de Graaff Generator A VdG collects large amounts of charge on the dome. At the bottom is an acetate roller and at the top a polythene one. How do you think charge reaches the top?

  5. AQA Additional Science • 21.25% • PSA B2 Biology 45 min exam May 08 25% • C2 Chemistry 45 min exam Jun 08 25% • P2 Physics 45 min exam Jun 08 25% • Additional ISA 3.75%

  6. PSA - Practical Skills Assessment

More Related