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3 Cards in this Set
- Front
- Back
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The protons and neutrons make up the nucleus of the atom. Electrons move about in the space round the nucleus. An uncharged atom has equal numbers of electrons and protons. |
A proton has a positive charge. An electron has an equal negative charge. A neutron is uncharged. |
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i) Adding electrons to an uncharged atom makes it negative.ii) Removing electrons from an uncharged atom makes it positive. |
i) Insulating materials that lose electrons when rubbed become positivelyLike charges repel; unlike charges attract.charged.ii) Insulating materials that gain electrons when rubbed become negativelycharged. An electric current is a flow of charge. |
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An isolated metal object that is initially uncharged will gain charge if it isbrought into contact with a charged object.A metal object is earthed by connecting it to the ground. |
Applications of electrostatics include the electrostatic paint sprayer, the electrostatic precipitator to remove smoke and dust particles from flue gases and the photocopier. i) A spark from a charged object can make powder grains or certain gases explode.ii) To eliminate static electricity, use antistatic materials and earth metal pipes and objects (i.e. connect them to the ground). |
