OHMITE's RES1K5E is a wirewound rheostat, a type of variable resistor used for controlling electrical current in circuits. These rheostats are electro-mechanical devices, subject to mechanical wear and therefore have a finite life. They are commonly used in applications requiring adjustable resistance, such as motor speed control, lighting dimmers, and volume controls. Models H, J, K, L, and N are listed under UL File No. E-10946 and CSA File No. 21309. All rheostats have a 10% tolerance.