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Electronics All-in-One For Dummies, UK Edition by Doug Lowe, Dickon Ross

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Chapter 2

Working with Resistors

In This Chapter

arrow Understanding and measuring resistance

arrow Calculating resistance with Ohm’s law

arrow Determining resistor values and tolerance

arrow Working with resistors in series, parallel and combination

arrow Creating a voltage-divider circuit

arrow Looking at how a potentiometer varies resistance

Sci-fi villains the Borg from Star Trek: The Next Generation had a saying: ‘Resistance is futile’. Captain Picard and the rest of the crew of the Enterprise eventually proved the Borg wrong of course.

Resistance isn’t useful only in battling hostile aliens – it’s also vital in electronics, which is all about manipulating the flow of current. One of the most basic ways to do so is to reduce it through resistance. Without resistance, current flows unregulated with no way to coax it into doing useful work.

In this chapter, you find out what resistance is and how to work with resistors, ...

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