A variable resistor constructed from a minimum of parts, includes a housing having longitudinal grooves adapted to retain a base plate carrying a resistance element. The base plate can be inserted in one end of the grooves and slid forwardly until its leading edge abuts a stop on the housing. Latching portions carried by the housing and spaced rearwardly from the stop, engage behind step portions on the base plate to prevent it from sliding rearwardly from the housing.
