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Teach Yourself Electricity and Electronics, Sixth Edition, 6th Edition by Simon Monk, Stan Gibilisco

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25

CHAPTER

Power Supplies

A POWER SUPPLY CONVERTS UTILITY AC TO PURE DC OF THE SORT WE GET FROM AN ELECTROchemical or solar battery. In this chapter, we’ll examine the components of a typical power supply.

Power Transformers

We can categorize power transformers in two general ways: step-down or step-up. As you remember, the output, or secondary, voltage of a step-down transformer is lower than the input, or primary, voltage. The reverse holds true for a step-up transformer, where the output voltage exceeds the input voltage.

Step-Down

Most electronic devices need only a few volts to function. The power supplies for such equipment use step-down power transformers, with the primary windings connected to the utility AC outlets. The transformer’s ...

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