Series Resistor

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Short Definition
A resistor installed in series with a load.
LED with a series resistor to limit current.

A resistor installed in series with a load, whose purpose is to limit the current. Current flowing through the resistor will result in a voltage being developed across the resistor. This is the voltage drop. A typical application is to limit current flow in an LED, or to create a voltage drop for a lamp that would be destroyed if exposed to full voltage.

It may also be called a current limiting resistor. As it follows Ohm's Law, the voltage across the series resistor is proportional to the current flowing through it. See the page on LEDs for more information.