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.
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