barcode in vb.net 2005 Relative current versus relative voltage for different resistances. in Software

Making QR Code in Software Relative current versus relative voltage for different resistances.

2-2 Relative current versus relative voltage for different resistances.
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When you are charged up with static electricity, there aren t very many charge carriers. A dry cell runs short of energy after awhile, and can no longer deliver as much current. All power supplies have their limitations in terms of the current they can provide. A power plant, or a power supply that works off of the utility mains, or a very large electrochemical battery, has a large capacity. You can then say that if you cut the resistance by a factor of 100, you ll get 100 times as much current. Or perhaps even 1000 or 10,000 times the current, if the resistance is cut to 0.001 or 0.0001 its former value.
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26 Electrical units
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The ampere
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Current is a measure of the rate at which charge carriers flow. The standard unit is the ampere. This represents one coulomb (6,240,000,000,000,000,000) of charge carriers per second past a given point. An ampere is a comparatively large amount of current. The abbreviation is A. Often, current is specified in terms of milliamperes, abbreviated mA, where 1 mA 0.001 A or a thousandth of an ampere. You will also sometimes hear of microamperes ( A), where 1 A 0.000001 A 0. 001 mA, a millionth of an ampere. And it is increasingly common to hear about nanoamperes (nA), where 1 nA 0. 001 A 0.000000001 A (a billionth of an ampere). Rarely will you hear of kiloamperes (kA), where 1 kA 1000 A. A current of a few milliamperes will give you a startling shock. About 50 mA will jolt you severely, and 100 mA can cause death if it flows through your chest cavity. An ordinary 100-watt light bulb draws about 1 A of current. An electric iron draws approximately 10 A; an entire household normally uses between 10 A and 50 A, depending on the size of the house and the kinds of appliances it has, and also on the time of day, week or year. The amount of current that will flow in an electrical circuit depends on the voltage, and also on the resistance. There are some circuits in which extremely large currents, say 1000 A, flow; this might happen through a metal bar placed directly at the output of a massive electric generator. The resistance is extremely low in this case, and the generator is capable of driving huge amounts of charge. In some semiconductor electronic devices, such as microcomputers, a few nanoamperes will suffice for many complicated processes. Some electronic clocks draw so little current that their batteries last as long as they would if left on the shelf without being put to any use at all.
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Resistance and the ohm
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Resistance is a measure of the opposition that a circuit offers to the flow of electric current. You might compare it to the diameter of a hose. In fact, for metal wire, this is an excellent analogy: small-diameter wire has high resistance (a lot of opposition to current flow), and large-diameter wire has low resistance (not much opposition to electric currents). Of course, the type of metal makes a difference too. Iron wire has higher resistance for a given diameter than copper wire. Nichrome wire has still more resistance. The standard unit of resistance is the ohm. This is sometimes abbreviated by the upper-case Greek letter omega, resembling an upside down capital U ( ). In this book, we ll just write it out as ohm or ohms. You ll sometimes hear about kilohms where 1 kilohm 1,000 ohms, or about megohms, where 1 megohm 1,000 kilohms 1,000,000 ohms. Electric wire is sometimes rated for resistivity. The standard unit for this purpose is the ohm per foot (ohm/ft) or the ohm per meter (ohm/m). You might also come across the unit ohm per kilometer (ohm/km). Table 2-1 shows the resistivity for various common sizes of wire. When 1V is placed across 1 ohm of resistance, assuming that the power supply can
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