What is a resistor?
a component with a fixed resistance
a component that stores charge
an electric device for variable resistance
a component that supplies voltage
A i think?
second choice is a capacitor
third choice is a potentiometer (technically a variable resistor.....like a volume control)
fourth choice is a power supply or battey
A potentiometer also divides the current flow. A device that does nothing else except vary the resistance is a rheostat.