Teach Yourself Electricity and Electronics, Sixth Edition, 6th Edition

18

CHAPTER

Transformers and Impedance Matching

WE CAN USE A TRANSFORMER TO OBTAIN THE OPTIMUM VOLTAGE FOR A CIRCUIT, DEVICE, OR SYSTEM. Transformers have various uses in electricity and electronics. For example, they can:

•   Match the impedances between a circuit and a load

•   Match the impedances between two different circuits or devices

•   Provide DC isolation between circuits or devices while letting AC pass

•   Make balanced and unbalanced circuits, feed systems, and loads compatible

Principle of the Transformer

When we place two wires near and parallel to each other and then drive a fluctuating current through one of them, a fluctuating current appears in the other, even though no direct physical connection exists between them. We call ...