The construction of rheostat is almost similar to the potentiometer. Like the potentiometer, the rheostat also consists of three terminals: terminal A, terminal B and terminal C. However, we use only two terminals: either A and B or B and C.

Does rheostat have positive and negative terminal?

No there are no differences other than physical position. The rheostat is just a variable resistor with no regard to polarity.

How many terminals does a rheostat?

Rheostat is a device connected in the circuit to vary the resistance. We can provide the resistance required by just adjusting the wiper. Rheostat is generally having 3 terminals in the circuit. We can use these 3 terminals.