Charge-An Imbalance of electrons
Static electricity is the movement of electrons from one material to another, for example; When an acetate is rubbed with a duster, electrons are tranferred from the rod to the duster leaving the rod positively charged and the duster negativly charged.
Postive charge- Lack of electrons
Negative charge- Excess of Electrons
Static electricty is not usually dangerous but more of an annoyance:
-Dust and dirt are attracted to insulators (such as the telly, this also explains why dusters work, because the dust is attracted to the cloth) and clothes made from man-made materials ofter cling to the body or each other.
Static Electricity- Continued
Static electricity can, however, be dangerous in some situations;
- Static electricity in the pit (formula 1 racing)- Charge built up by the car during the race could set any fuel leaks on fire, or hurt someone changing the tyres.
- Oil Rigs- Static electricity from clothes could set light to the crude oil
Electric shocks can be avoided by;
- Having a earth wire, any object that could build up charge is connected to earth so that any possible build up is immediately discharged away safely.
- In factories, the operator of any machinery that could build up charge stands on rubber mats so that the machine does not discharge through them.
Anti-Static sprays, cloth and liquids are made from a conductding material to carry away charge.
Static electricity is used in a variety of different ways in everyday life;
These are used to restore heart rhythm by delivering an electric shock through the Chest-Wall to the heart.