Receiving an electric shock from a doorknob is an example of static electricity. Static electricity is a cause of an imbalance of positive and negative charges. It is built up when electrons are pulled from one surface to another. Adhesion is the force that causes electrons to move between surfaces. An atom has neutral charges when it has an equal number of protons and electrons. Rubber is a type of insulator, while gold is a conductor. Electrons have a negative charge, and protons have a positive charge. Static electricity is best described as a one-time shock of electricity, like the electricity from a lightning bolt.
Uses of static electricity:
When you take off your wool hat, it rubs against your hair. Electrons travel from your hair to the hat. A static charge constructs. Things with the same charge repel each other. So the hairs try to get as far from each other as possible. The farthest they can get is by standing on end. This is how static electricity causes a bad hair day!
Static electricity is an electric charge that has built up on an object. It is often created when two objects that are poor electrical conductors are rubbed together. The electrons of one object rub of onto another object.
We need static electricity to use electrical static precipitators to remove all the dust that comes out of a power station furnaces-instead of it all belching out into the air.
Some problems that are caused by static electricity are, Air rushing past a car will drag negative charges off the car body and leave it with an overall positive charge. This sounds pretty harmless until you go out and touch the car. That’s when all the static charge suddenly flows through the end of your finger.
Examples of uses of static electricity:
Static Charges give a great paint job, the car body is given a negative charge – the paint is given a positive charge. Now because like charges repel, the positively charged paint droplets all repel each other and so they spread out really well. And because opposite attract – the paint droplets are attracted to the body.
Some insulating materials become electrically charged when they are rubbed together. Charges that are the same repel, while unlike charges magnetize. Electrostatic precipitators, photocopiers and laser printers make useful use of electrostatic charges.
The Van de Graaff Generator:
Van de Graaff generator is a device designed to create static electricity and make it available for experimentation. The American physicist Robert Jemison Van de Graaff invented the Van de Graaff generator in 1931. The device that stands his name is able to produce extremely high voltages -- as high as 20 million volts.
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