A sliding rheostat consists of several key components: Wiring Post: Connects the rheostat to the circuit. Coil (Resistance Wire): Typically made of constantan or nickel-chromium alloy, this wire determines. In summary, the easiest way to remember the difference between a rheostat vs. Since the current is flowing during adjustment, Ohmite Rheostats carry a UL rating with 11 standard sizes and multiple shaft designs allowing many variations. Ohmite also offers full custom solutions to accommodate specialty applications. Higher power ratings are reached by assembling several units. Smart Filtering As you select one or more parametric.