what is variable resistance?
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A variable resistor is a resistor of which the electric resistance value can be adjusted. ... When a variable resistor is used as a potential divider by using 3 terminals it is called a potentiometer. When only two terminals are used, it functions as a variable resistance and is called a rheostat.
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Variable resistance or we called rheostat used to vary the amount of current(or it changes the resistance in a circuit).
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