Resistors

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--Color Code		--Resistive Attenuator Design
	--Fun with Resistors	--Intuitive Electronics Page

1/4 Watt	"Fixed"	.	Single Turn Trimmer	"Pot"	Multi-turn Trimmer
		.
Fixed	Symbol	.	Potentiometer	Symbol	Potentiometer



Wire Wound Resistor tied as a Rheostat	Wire Wound Resistor tied as a Voltage Divider

Resistors do a lot of Useful Things!

Voltage to Current Convertor When driving the input (base) of a transistor gain stage: you must convert the input voltage to a current by using a voltage to current convertor--a resistor.
Current to Voltage Convertor When deriving a voltage from the collector of a transistor amplifier stage: you convert the output (collector) current into a voltage by using a Current to Voltage convertor in the collector circuit--you guessed it--a resistor.

Resistance is Determined partially by Composition,
and is inversely proportional to Cross Sectional Area

Notice Also that Resistance is proportional to Length

Resistor- Color -Code -----------------

4 Band Color Code

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voltage resistor current convertor collector

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