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With the addition of energy, the outer electrons can be removed from atoms An atom missing electrons has an overall positive charge, and consequently, any matter made of these electron-deficient atoms is positively charged The freed electrons can remain unattached or become attached to other atoms, resulting in negatively charged particles From a microscopic viewpoint, acquiring charge is a process of transferring electrons Separation of charge If two neutral objects are rubbed together, each can become charged For instance, when rubber and wool are rubbed together, electrons from atoms on the wool are transferred to the rubber, as shown in Figure 20-3 The extra electrons on the rubber result in a net negative charge The electrons missing from the wool result in a net positive charge The combined total charge of the two objects remains the same Charge is conserved, which is one way of saying that individual charges never are created or destroyed All that happens is that the positive and negative charges are separated through a transfer of electrons Complex processes that affect the tires of a moving car or truck can cause the tires to become charged Processes inside a thundercloud can cause the cloud bottom to become negatively charged and the cloud top to become positively charged In both these cases, charge is not created, but separated
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Conductor or Insulator It might be tempting to classify an element as solely a conductor or solely an insulator, but the classification can change depending on the form the element takes For example, carbon in the form of diamond is an insulator, but carbon in the form of graphite can conduct charge This is because the carbon atoms in diamonds are tightly bonded to four other carbons, while the carbon atoms in graphite form three stronger bonds and a fourth, weaker bond that allows electrons a limited amount of movement As a result, graphite is a much better conductor than diamond, even though both are simply carbon atoms
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Hold a plastic rod or comb at its midpoint and rub only one end You will find that only the rubbed end becomes charged In other words, the charges that you transferred to the plastic stayed where they were put; they did not move A material through which a charge will not move easily is called an electric insulator The strips of tape that you charged earlier in this chapter acted in this way Glass, dry wood, most plastics, cloth, and dry air are all good insulators Suppose that you support a metal rod on an insulator so that it is isolated, or completely surrounded by insulators If you then touch the charged comb to one end of the metal rod, you will find that the charge spreads very quickly over the entire rod A material that allows charges to move about easily is called an electric conductor Electrons carry, or conduct, electric charge through the metal Metals are good conductors because at least one electron on each atom of the metal can be removed easily These electrons act as if they no longer belong to any one atom, but to the metal as a whole; consequently, they move freely throughout the piece of metal Figure 20-4 contrasts how charges behave when they are
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20 Static Electricity
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Figure 20-4 Charges placed on a conductor will spread over the entire surface (a) Charges placed on an insulator will remain where they are placed (b)
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Conductor
Insulator
placed on a conductor with how they behave on an insulator Copper and aluminum are both excellent conductors and are used commercially to carry electricity Plasma, a highly ionized gas, and graphite also are good conductors of electric charge When air becomes a conductor Air is an insulator; however, under certain conditions, charges move through air as if it were a conductor The spark that jumps between your finger and a doorknob after you have rubbed your feet on a carpet discharges you In other words, you have become neutral because the excess charges have left you Similarly, lightning discharges a thundercloud In both of these cases, air became a conductor for a brief moment Recall that conductors must have charges that are free to move For a spark or lightning to occur, freely moving charged particles must be formed in the normally neutral air In the case of lightning, excess charges in the cloud and on the ground are great enough to remove electrons from the molecules in the air The electrons and positively or negatively charged atoms form a plasma, which is a conductor The discharge of Earth and the thundercloud by means of this conductor forms a luminous arc called lightning In the case of your finger and the doorknob, the discharge is called a spark
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