How do you replace a rheostat switch?

To replace a rheostat switch, first, ensure the power is turned off to the circuit to avoid electrical shock. Remove the old rheostat by unscrewing any mounting screws and disconnecting the wires, noting their positions for the new switch. Connect the wires to the new rheostat according to the original configuration, then secure it in place. Finally, restore power and test the new switch to ensure it operates correctly.