Arcol vrh320 series variable wirewound rheostats 10 315w arcol vrh320 10k k a 10k high quality variable resistor designed as a rheostat that is encapsulated in a lacquered metal casing a slide is used to carry out adjustment suitable for applications such as battery charging motor control educational demonstrations heatersovens arcol vrh320 10k k 10 315w wirewound slide rheostat