6
CHAPTER
Resistors
ALL ELECTRICAL COMPONENTS, DEVICES, AND SYSTEMS EXHIBIT RESISTANCE. IN PRACTICE, PERFECT conductors don’t exist. You’ve seen some examples of circuits containing components designed to reduce or limit the current. We call these components resistors.
Purpose of the Resistor
Resistors play diverse roles in electrical and electronic equipment, despite the fact that their only direct action constitutes interference with the flow of current. Common applications include the following:
• Voltage division
• Biasing
• Current limiting
• Power dissipation
• Bleeding off charge
• Impedance matching
Voltage Division
You’ve learned how to build voltage dividers using resistors. The resistors dissipate some power in doing this ...
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