Does anyone know how to make a wheatstone bridge? I have some ideas on how to build one but they are not as cheap as I would like. The limit on material costs is $5. Isn't it like a circuit type of thing where you have 3 known resistors and use it to figure out the value of the unknown 4th resistor and one of the resistors is adjustable... Is there suppose to be like a galvanometer to measure the differences and stuff and how would you make a galvanometer that would connect to the bridge? One more thing, how would you make an adjustable resistor, could you use nichrome wire to do it or something :?: