Physics - Electricity - Variable Resistance Many thanks for checking out our website. Below are a list of our on-line products.   Knife Switch KST/EI/1263   Resistance Coil KST/EI/1264   Thermocouple KST/EI/1265 Contact Key KST/EI/1266   Contact Key KST/EI/1267   Conncting wire KST/EI/1268 Simple circuit KST/EI/1269   Resistance Coil KST/EI/1270   Loud Speaker KST/EI/1271