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Updated: May 13, 2025
The enormous use of both step-up and step-down transformers transformers which respectively induce currents of higher and of lower electromotive forces in their secondary coils than are passed through their primaries shows the great practical value of this invention.
It is an interesting fact that it was not in the form of the step-down alternating-current transformer that Faraday's discovery of voltaic-current induction was first utilized, but in the form of a step-up transformer, or what was then ordinarily called an induction coil.
The hovels are more underground than above the surface, and often, when the village occupies sloping ground, the upper edge of the roof is practically but a continuation of the solid ground, or at the most there is but a single step-up between them.
The high pressures required for the economical use of transmission lines necessitates the employment of transformers at each end of the line; namely, step-up transformers at the transmitting end, to raise the voltage delivered by the generators, and step-down transformers, at the receiving end, to lower it for use in the various translating devices.
When sounds vibrate the ribbon extremely low alternating voltages are developed at the ends of the ribbon, which has a very low impedance of only 0.15 ohm, necessitating the use of a step-up transformer of 1:45 turns ratio very close to it. The frequency response is 20 to 16,000 Hz.
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