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Static Electricity by Mind Map: Static Electricity
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Static Electricity

This is just a demo map that you can delete right away, if you feel like it...

Type of charges

positive charge e.g. glass rubbed with silk perspex rubbed with wool

negative charge e.g. amber rubbed with fur rubber rubbed with fur polythene rubbed with wool

methods of charging

by rubbing

as fur rubs the amber, electrons from the fur deposits on the amber. This makes the amber negatively charged while the fur is positively charged

by induction

defined as the production of electric charges on the surface of a conductor when under the influence of an electric field, can be repeated my times without loss of charge

by induction earthing process

similar as normal induction just with earth used rather than two conductors

law of charges

like charges repel. unlike charges attract.

Dangers and application of electrostatics

dangers

friction on the tires of a lorry moving makes its metal body become positively charged by induction. this can cause sparks which can ignite a flammable load, a chain or conducting strip is dangled from the lorry to earth its metal body

synthetic fibers in clothes can easily be charged by rubbing. charges can be picked up by walking on carpets made of synthetic material. a spark on a dry day, can ignite the clothes

application

printing, static causes toner to stick to a selenium coated drum which will then print

precipatators, removes ash and dust with electrostatic by ionizing the air thus charging the ash and dust which will then get stuck to the metal plates

paint spraying, using electrostatic can ensure the paint is equally coated

Electric fields

rules in sketching electric fields

no two field lines can cross each other

lines must go from positive to negative charges

number of lines leaving a positive charge is proportional to the magnitude of the charge

defined as the region electric charges exert a force

electric field line

the path a positive charge takes if it is free to move