barcode printing using vb.net Holes move in the opposite direction from electrons in a semiconducting material. in Software

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1-6 Holes move in the opposite direction from electrons in a semiconducting material.
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Static electricity 15 When most of the charge carriers are electrons, the semiconductor is called N-type, because electrons are negatively charged. When most of the charge carriers are holes, the semiconducting material is known as P-type because holes have a positive electric charge. But P-type material does pass some electrons, and N-type material carries some holes. In a semiconductor, the more abundant type of charge carrier is called the majority carrier. The less abundant kind is known as the minority carrier. Semiconductors are used in diodes, transistors, and integrated circuits in almost limitless variety. These substances are what make it possible for you to have a computer in a briefcase. That notebook computer, if it used vacuum tubes, would occupy a skyscraper, because it has billions of electronic components. It would also need its own power plant, and would cost thousands of dollars in electric bills every day. But the circuits are etched microscopically onto semiconducting wafers, greatly reducing the size and power requirements.
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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 one second. Usually, a great many charge carriers go past any given point in one 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 zeroes) charge carriers per second. Even the smallest mini-bulb carries quadrillions (numbers followed by 15 zeroes) of charge carriers every second. It is ridiculous to speak of a current in terms of charge carriers per second, so usually 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 one coulomb per second is called an ampere, and this is the standard unit of electric current. A 100-watt bulb in your desk lamp draws about one 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. Even the best incandescent lamp is inefficient, creating more heat than light energy. Fluorescent lamps are better. They produce more light for a given amount of current. Or, to put it another way, they need less current to give off a certain amount of light. Electric current flows very fast through any conductor, resistor, or semiconductor. In fact, for most practical purposes you can consider the speed of current to be the same as the speed of light: 186,000 miles per second. Actually, it is a little less.
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Static electricity
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Charge carriers, particularly electrons, can build up, or become deficient, on things without flowing anywhere. You ve probably experienced this when walking on a carpeted floor during the winter, or in a place where the humidity was very low. An excess or shortage of electrons is created on and in your body. You acquire a charge of static
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16 Basic physical concepts 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 that might well startle you. It is the current, during this discharge, that causes the sensation that might make you jump. 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, two inches, or even six 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 some high school physics labs, can cause a spark this large (Fig. 1-7). You have to be careful when using this device for physics experiments.
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