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gcse science P4 - A

specific for ocr gateway additonal science B.

QuestionAnswer
what is a conductor? something that allows an electric charge to pass through it
give an example of a good conductor? metals
what is an insulator? something which doesn't allow an electric charge to pass through it
give examples of an insulator? plastic, wood, glass, polythene
when can insulators become electrically charged? when rubbed together
what is a stable atom? when there are the same amounts of positive and negative charges
what are electrostatic effects due to? the movement of electrons
what happens to like charges? they repel
what happens to opposite charges? they repel
what happens when an object loses electrons? becomes positive
what happens when an object gains electrons? becomes negative
what happens when a polythene rod is rubbed with a duster? electrons are transferred from the duster to the polythene, making the polythene rod negatively charged
what happens when an acetate rod is rubbed with a duster? electrons are transferred from the acetate to the duster, leaving the acetate rod positively charged
what do you get an electric shock from? charged objects
what is an example of charged objects? nylon and other synthetic fibres
what happens if you are charged and you touch something that is earthed? you get an electric shock
what happens if you are earthed and you touch something that is charged? you get an electric shock
what is an example of an electric shock? when you walk on a vinyl floor or one covered with a nylon carpet, you become charged because of friction. then if you earth yourself and touch something, you get an electric shock
when is static electricity a nuisance? -dust and dirt are attracted to insulators, such as television screens -clothes made from synthetic material often cling to each other and to the body
when is static electricity dangerous? -there are flammable gases, vapours or a high concentration of oxygen. A spark could ignite the gases and cause an explosion -you touch something with a large electric charge on it. The charge will cause an electric shock, sometimes being fatal
what items prevent a build up of charge and how? -anti-staticc sprays, liquids and clothes -by conducting/carrying it away
how can you reduce the chance of receiving an electric shock? 1 -an object that is likely to become charged is connected to earth, any build up of charge would flow down to the earth wire
how can you reduce the chance of receiving an electric shock? 2 -in a factory where machinery is at risk of becoming charged, the operators stand on insulating rubber mats or wear shoes with insulating soles, so the charge can't flow down to earth
how can you reduce the chance of receiving an electric shock? 3 -Lorries containing flammable gases, liquids and powders are earthed by an earth wire before being unloaded. This means charge immediately flows down the earth wire preventing a spark causing an explosion.
Created by: jirwin
 

 



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