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Whenever there is movement of charge carriers in a substance, there is an electric current. Current is measured in terms of the number of electrons or holes passing a single point in 1 second. A great many charge carriers go past any given point in 1 second, even if the current is small. In a household electric circuit, a 100-watt light bulb draws a current of about six quintillion (6 followed by 18 zeros) charge carriers per second. Even the smallest bulb carries quadrillions (numbers followed by 15 zeros) of charge carriers every second. It is impractical to speak of a current in terms of charge carriers per second, so it is measured in coulombs per second instead. A coulomb is equal to approximately 6,240,000,000,000,000,000 electrons or holes. A current of 1 coulomb per second
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is called an ampere, and this is the standard unit of electric current. A 100-watt bulb in your desk lamp draws about 1 ampere of current. When a current flows through a resistance and this is always the case because even the best conductors have resistance heat is generated. Sometimes light and other forms of energy are emitted as well. A light bulb is deliberately designed so that the resistance causes visible light to be generated. Electric current flows at high speed through any conductor, resistor, or semiconductor. Nevertheless, it is considerably less than the speed of light.
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Charge carriers, particularly electrons, can build up, or become deficient, on things without flowing anywhere. You ve experienced this when walking on a carpeted floor during the winter, or in a place where the humidity was low. An excess or shortage of electrons is created on and in your body. You acquire a charge of static electricity. It s called static because it doesn t go anywhere. You don t feel this until you touch some metallic object that is connected to earth ground or to some large fixture; but then there is a discharge, accompanied by a spark. If you were to become much more charged, your hair would stand on end, because every hair would repel every other. Like charges are caused either by an excess or a deficiency of electrons; they repel. The spark might jump an inch, 2 inches, or even 6 inches. Then it would more than startle you; you could get hurt. This doesn t happen with ordinary carpet and shoes, fortunately. But a device called a Van de Graaff generator, found in physics labs, can cause a spark this large (Fig. 1-7). Be careful when using this device for physics experiments!
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a Van de Graaff generator. This machine can create a charge buildup large enough to produce a spark several centimeters long.
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1-8 Electrostatic charges can build up between clouds in a thunderstorm (A), or
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between a cloud and the surface of the earth (B).
In the extreme, lightning occurs between clouds, and between clouds and ground in the earth s atmosphere. This spark, called a stroke, is a magnified version of the spark you get after shuffling around on a carpet. Until the stroke occurs, there is a static charge in the clouds, between different clouds or parts of a cloud, and the ground. In Fig. 1-8, cloud-to-cloud (A) and cloud-to-ground (B) static buildups are shown. In the case at B, the positive charge in the earth follows along beneath the storm cloud. The current in a lightning stroke is usually several tens of thousands, or hundreds of thousands, of amperes. But it takes place only for a fraction of a second. Still, many coulombs of charge are displaced in a single bolt of lightning.
Electromotive Force
Current can only flow if it gets a push. This can be caused by a buildup of static electric charges, as in the case of a lightning stroke. When the charge builds up, with positive polarity (shortage of electrons) in one place and negative polarity (excess of electrons) in another place, a powerful electromotive force (EMF) exists. This force is measured in units called volts. Ordinary household electricity has an effective voltage of between 110 and 130; usually it is about 117. A car battery has an EMF of 12 to 14 volts. The static charge that you acquire when walking on a carpet with hard-soled shoes is often several thousand volts. Before a discharge of lightning, millions of volts exist. An EMF of 1 volt, across a resistance of 1 ohm, will cause a current of 1 ampere to flow. This is a classic relationship in electricity, and is stated generally as Ohm s Law. If
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