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You might expect that the current ID, passing through the channel of a JFET, would increase linearly with increasing drain voltage ED. But this is not, in general, what happens. Instead, the current ID rises for awhile, and then starts to level off. The drain current ID (which is the same as the channel current) is often plotted as a function of drain voltage, ED, for various values of gate voltage, EG. The resulting set of

NOW THAT YOU RE FAMILIAR WITH THE PRIMARY UNITS COMMON IN ELECTRICITY AND ELECTRONICS, let s look at the instruments that are employed to measure these quantities. Many measuring devices work because electric and magnetic fields produce forces proportional to the intensity of the field. Such meters work by means of electromagnetic deflection or electrostatic deflection. Sometimes, electric current is measured by the extent of heat it produces in a resistance. Such meters work by thermal heating principles. Some meters have small motors whose speed depends on the measured quantity. The rotation rate, or the number of rotations in a given time, can be measured or counted. Still other kinds of meters tally up electronic pulses, sometimes in thousands, millions, or billions. These are electronic counters.

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422 The field-effect transistor curves is called a family of characteristic curves for the device. The graph of Fig. 23-6 shows a family of characteristic curves for a hypothetical N-channel JFET. Engineers make use of these graphs when deciding on the best JFET type for an electronic circuit. Also of importance is the curve of ID vs EG, one example of which is shown in Fig. 23-5.

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Recall the discussion of dynamic current amplification from the last chapter. This is a measure of how well a bipolar transistor amplifies a signal. The JFET analog of this is called dynamic mutual conductance or transconductance. Refer again to Fig. 23-5. Suppose that EG is a certain value, with a corresponding ID resulting. If the gate voltage changes by a small amount dEG then the drain current will also change by a certain increment dID. The transconductance is the ratio dID/dEG. Geometrically, this translates to the slope of a line tangent to the curve of Fig. 23-5. The value of dID/dEG is obviously not the same everywhere along the curve. When the JFET is biased beyond pinchoff, in the region marked Y in the figure, the slope of the curve is zero. There is no drain current, even if the gate voltage changes. Only when the channel is conducting will there be a change in ID when there is a change in EG. The region where the transconductance, dID/dEG, is the greatest is the region marked X, where the slope of the curve is steepest. This is where the most gain can be obtained from the JFET.

Early experimenters with electricity and magnetism noticed that an electric current produces a magnetic field. When a magnetic compass is placed near a wire carrying a direct electric current, the compass doesn t point toward magnetic north. The needle is displaced. The extent of the displacement depends on how close the compass is brought to the wire, and also on how much current the wire is carrying. When this effect was first observed, scientists tried different arrangements to see how much the compass needle could be displaced, and how small a current could be detected. An attempt was made to obtain the greatest possible current-detecting sensitivity. Wrapping the wire in a coil around the compass resulted in a device that could indicate a tiny electric current (Fig. 3-1). This effect is known as galvanism, and the meter so devised was called a galvanometer. Once this device was made, the scientists saw that the extent of the needle displacement increased with increasing current. Then, the only challenge was to calibrate the galvanometer somehow, and to find a standard so a universal meter could be engineered. You can make your own galvanometer. Buy a cheap compass, about 2 feet of insulated bell wire, and a 6-volt lantern battery. Set it up as shown in Fig. 3-1. Wrap the wire around the compass four or five times, and align the compass so that the needle points along the wire turns while the wire is disconnected from the battery. Connect one end of the wire to the negative ( ) terminal of the bat36

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