Rheostat is wire wounded resistance. It has two uses. It can be either used as variable resistor or potential divider.
We have two terminal that are connected to the wire . Suppose that a third terminal is also present, which is on top of other two terminals used as a sliding terminal.
Now , when we use the it as a variable resistor.
We have to
insert one terminal say A and sliding C , now we can say resistance of A and C is used. SO , when sliding terminal is moved away from point A Resistance increases and length do also, but when the sliding terminal is moved towards the point A length as well resistance decreases.
We have two terminal that are connected to the wire . Suppose that a third terminal is also present, which is on top of other two terminals used as a sliding terminal.
Now , when we use the it as a variable resistor.
We have to
insert one terminal say A and sliding C , now we can say resistance of A and C is used. SO , when sliding terminal is moved away from point A Resistance increases and length do also, but when the sliding terminal is moved towards the point A length as well resistance decreases.
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