carotid-bruit
发表于 2025-3-25 04:28:32
Electrical Generators and Power Distribution,a permanent magnet was moved towards a coil of wire — see Figure 8.1 — an e.m.f. was induced in the coil. That is, the e.m.f. is induced by the relative movement between the magnetic field and the coil of wire. Lenz’s law allows us to predict the polarity of the induced e.m.f.
作呕
发表于 2025-3-25 11:18:25
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Harass
发表于 2025-3-25 13:50:56
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forbid
发表于 2025-3-25 19:52:51
Measuring Instruments and Electrical Measurements,principles of instruments are beyond the technical level reached at this point in the book and we are in the ‘chicken and the egg’ dilemma, insomuch that it is difficult to explain how an instrument works before its principle can be fully comprehended.
误传
发表于 2025-3-25 20:51:46
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Dungeon
发表于 2025-3-26 03:42:35
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消灭
发表于 2025-3-26 06:22:47
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acrobat
发表于 2025-3-26 10:19:34
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拖网
发表于 2025-3-26 12:40:30
Alternating Current,at one moment and in the opposite direction (the ‘negative’ direction) the next moment. The frequency of alternations can be as low as once every few seconds or as high as once every few nanoseconds (1 ns = 10. s or .).
hazard
发表于 2025-3-26 20:32:35
Single-Phase a.c. Calculations, the voltage and the current in a circuit element depends on the nature of the element, in other words, is it an . or an . or a .? This means that in an a.c. circuit you cannot simply add the . values of ., . and . together to get the value of the supply voltage .; the reason for this is that the .