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This exploration of magnetism was interesting in its own right, though the point was to see how electricity and the magnetic eld interact. An inductor has some aspects of a motor and some aspects of a generator, with none of the moving parts. Inductors are constructed just like electromagnets, with wire wrapped around a core. Instead of soft iron, however, inductors tend to use ferrite cores. Ferrite is a type of ceramic lled with iron, boron, or some other metal that reacts with magnetic elds. Ferrite can store
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CHAPTER 11 Inductance and Magnetism
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a stronger magnetic eld than plain iron, giving you more power for a given core size. Ferrite is also brittle, so it isn t used in motors and generators.
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Let s look at what happens when we apply a charge to a simple wire, creating a voltage di erential across the wire. But let s slow down the action a lot. When you rst apply a charge to one end of the wire it creates a charge imbalance, causing the electrons to move along the wire. This, of course, is current. A change in current creates a magnetic eld that grows outward from the wire. This is a moving magnetic eld and, as discussed in 4, a magnetic eld moving across a wire creates current. This generated current opposes the applied current, reducing the actual current owing through the wire. Once the current has stabilized, the magnetic eld stops moving. When the magnetic eld stops moving, it stops generating the opposing current. At that point, the wire is just a wire again with its ordinary resistance and a stable current. You may have noticed that the current in the wire creates a magnetic eld that grows across the same wire that created the eld, in turn generating a current opposite to the one that started the process. And you would be correct. What happens when you stop the current in the wire The magnetic eld moves again, in the opposite direction, as it collapses. This creates a current working to keep the ow moving. When the magnetic eld is gone, that generated current fades away with it. Inductors are like ywheels for current. They don t like to start moving and, once moving, they don t like to stop. Another way to look at the inductor is as a magnetic reservoir. When you rst apply current to an inductor, it takes that energy and uses it to ll up its magnetic eld. When the current is removed, the inductor empties its magnetic eld, converting it back into a current.
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This opposition to change is called inductance and all wires and components in your circuit are, to some extent, inductors.
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Inductance and Magnetism
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Fig. 11-7.
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Inductor.
If you wrap a wire around a ferrite core, it has a lot more inductance than a single wire in space. This would be an inductor as a component, as shown in Fig. 11-7. Inductance is measured in the henry (H), after the American scientist Joseph Henry who discovered a number of the phenomena that we call inductance. Inductors are often represented by the letter L in formulas and schematics. As in capacitors, we will normally work with microhenries (mH) and millihenries (mH) instead of full henries. You could experiment with the inductor the same way as you did with the capacitor, by inserting it into an audio circuit and listening to the changes. Where the capacitor prefers to pass high-frequency signals, the inductor passes low-frequency signals.
FILTERS
Try This: Since the inductor s response changes with the frequency of the signal, it can be used in a resistor-inductor (RL) lter, replacing the capacitor in the RC lter. Remember, however, that the inductor s response is the reverse of the capacitor s response. You can also combine the inductor and capacitor to make lters. Put an inductor by itself in series with your audio test station and see how it a ects the signal. Try building lters with the inductor, replacing the capacitor in your previous circuits, and see how they act.
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