Download PDF by Gosho Aoyama: Detective Conan, tome 18

By Gosho Aoyama

ISBN-10: 2871292124

ISBN-13: 9782871292128

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Extra resources for Detective Conan, tome 18

Example text

Ordinary powdered iron cores have a high percentage of ceramic and relatively little iron. This insures low loss in the cores and prevents abrupt saturation at high peak current level. Ferrites are a sophisticated type of 30. Chapter 2, Harris powdered iron core that looks more like black glass but has more iron and much less ceramic content. In spite of having little ceramic in the mixture, ferrites manage to insulate neighboring granules of iron from each other. With ferrites much higher inductances can be used at radio frequencies than would otherwise be practical.

Only when voltage is able to push electrons through a complete circuit, does anything happen. For example, unscrew a light bulb while it’s glowing. The light is extinguished because the current no longer passes through the bulb. That was obvious, but notice that current doesn’t jump across the terminals inside the bulb socket and it doesn’t leak 8. Chapter 2, Harris out into the room. There’s still plenty of voltage across the light socket terminals. You could put your finger in the socket to test it, but current would flow through your finger and, with household voltage, that is a very bad idea.

Inductive reactance From the point of view of a constant AC sinewave current, inductors look like resistors. At one extreme, if the frequency is infinitely high, the equivalent AC resistance is infinite. At the opposite end of the spectrum, to a DC current, the inductor just looks like a long piece of copper wire. In other words, at DC, a perfect inductor would have zero resistance. At frequencies between zero and infinity an inductor resists sinewave current flow as if it were a resistor. You can calculate the equivalent resistance or inductive reactance as follows: Reactance in ohms XL = 2 π (frequency) (Inductance in Henries) = 2 π f L For example, the reactance of a 5 Henry inductor at 60 Hz is: XL = 2 π (60 Hz) (5 H) = 1885 ohms Like capacitors, inductors can be used like resistors to attenuate currents or divide 22.

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Detective Conan, tome 18 by Gosho Aoyama


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